Hot extrusion is the main process for the production of zirconium alloy tubes， rods and profiles. However， zirconium alloy is easy to adhere to the mold under hot extrusion， and is difficult to lubricate， which greatly affects the machining accuracy and mold life. To solve the lubrication problem of zirconium alloy hot extrusion，low melting point borate glass and two-dimensional layered lubricants （MoS₂， graphite， etc.） are added into the PVA modified silicate coating to obtain good wetting property and high temperature wear resistance. In this study， the high-temperature physical and chemical properties of materials are studied through thermogravimetric analysis and differential scanning calorimetry. X-ray photoelectron spectroscopy and Fourier infrared spectroscopy are used to analyze the functional groups and chemical bonds of PVA-modified binders. For lubricating coatings， cross-cut test is taken to test the adhesion of the coating. X-ray diffractometer is used to test the phase change at high temperature. The lubrication performance is characterized by a high-temperature friction testing machine. After friction， optical microscopy and scanning electron microscopy are used to study the surface interface microstructure of the wear track. Energy dispersive X-ray spectroscopy is used to analyze the distribution of elements and phase composition in the wear track. After PVA modification， the contact angle between the lubricant slurry and the surface of the zirconium alloy is reduced from 64° to 43°， which is conducive to the spreading of the lubricant on the surface of the zirconium alloy. Moreover， the microhardness of the lubricating coating increases from 92HV_0.1 to 149HV_0.1， and the dropout rate is reduced from 42.5% to 9.1%. It is indicated that the mechanical properties of the coating are significantly improved. The high temperature oxidation experiment of 700 ℃ is carried out on the lubricating coating. The results show that the PVA-modified silicate lubrication coating still contains a certain amount of MoS₂. In contrast， there is almost no molybdenum disulfide in the lubricating coating that has not been modified with PVA， and even the zirconium alloy substrate is oxidized. This can be attributed to the C—O—Si bonds formed by PVA and silicates forming an inorganic silicon network structure in the coating， which plays a role in isolating air and preventing oxidation. In the friction experiment， the prepared coating can be effectively lubricated at 700 ℃. This is due to the fact that the molten glass powder itself has a certain lubricating ability at high temperature， coupled with the unoxidized two-dimensional layered lubrication materials， MoS₂ and graphite， so as to achieve excellent high-temperature lubrication performance. In this study， the prepared coating demonstrates good high-temperature lubrication performance， thermal protection performance， and ease of removal. It shows promising potential for application in the hot extrusion lubrication of difficult-to-process metals such as zirconium， titanium， and hafnium.