Porous ceramics are widely applied in catalysts supports, liquid/gas filters, biological scaffolds, thermal isolation and lightweight structural materials due to their low bulk density, high specific surface area, low thermal conductivity, excellent high-temperature resistance as well as corrosion resistance. Hierarchically porous ceramics integrating superiorities of various pore structures have multifunctionalities benefited from pores at different length scales and become the development mainstream of porous ceramics. However, there are still some challenges in the fabrication of hierarchically porous ceramics. Unlike conventional methods that require specific molds and fabricate products with a low forming accuracy, adding raw materials layer by layer with the assistance of additive manufacturing technique can fabricate high-precision products with various complex shapes. The forms of materials before printing include powder, bulk solid, wire and slurry. Compared to powder-based, bulk-based and wire-based additive manufacturing techniques, slurry-based additive manufacturing technique has some advantages of both additive manufacturing technique and colloidal forming method, favoring homogeneously mixing of multi-components, and realizing the fabrication of hierarchically porous ceramics with complex shape and fine microstructure by introducing pores in submicron- or nano-scale via other approaches for porous ceramics. This review represented five types of slurry-based additive manufacturing techniques i.e., stereolithography apparatus, digital light processing, two-photon polymerization, inkjet printing and direct ink writing. Also, hierarchically porous ceramics fabricated by slurry-based additive manufacturing technique with the existing methods for porous ceramics were analyzed. In addition, representative application and future development of the obtained hierarchically porous ceramics based on the slurry-based additive manufacturing technique were also outlined.