In order to comprehensively understand the construction standards for intelligent connected vehicle closed proving grounds, this paper provides an in-depth analysis of the “Specification for the Management of Road Testing of Intelligent Connected Vehicles (Trial)” and related standards and regulations. The specific requirements for 14 tests of intelligent connected vehicles in closed proving grounds are summarized. The main contents of constructing the closed test field for intelligent networked vehicles are organized. According to the relevant requirements, the intelligent networking transformation of the Hainan Proving Ground has been completed from 3 aspects: park renovation, hardware equipment facility construction, and software platform construction. This transformation aims to meet all closed test requirements for intelligent connected vehicles, serving as a reference for the construction of closed proving grounds or the upgrade of traditional proving grounds into intelligent connected proving grounds.