The invention discloses a CNG car pressure energy comprehensive utilization system. The CNG car pressure energy comprehensive utilization system comprises a turbine motor (a2) and further comprises atleast one of a permanent magnet synchronous motor (a3), a turbine (a4) and an air conditioner compressor (s5), wherein the turbine motor (a2) is connected with at least one of the permanent magnet synchronous motor (a3), the turbine (a4) and the air conditioner compressor (s5); the turbine motor (a2) is used for converting pressure energy in CNG into mechanical energy, the permanent magnet synchronous motor (a3) and the turbine motor (a2) are in breaking connection, and the permanent magnet synchronous motor (a3) is further connected with a battery set (a6) and is used for power generation through mechanical energy and storing the electric energy in the battery set (a6) or used for converting the stored electric energy into the mechanical energy under the effect of the electric energy. The work principle and all components of an existing CNG car are combined, through control over the key natural gas flow and the energy flow, the structure and the arrangement manner of key components in the system can be improved, and compared with the prior art, the problem that the CNG car is poor in resource utilization rate is solved.