The invention discloses a configurable passenger car body control system which comprises a vehicle-mounted integrated information module and a plurality of configurable control modules, wherein the vehicle-mounted integrated information module comprises a processor, an on-off input port, a control signal output port, high-speed and low-speed CAN bus interface modules, a digital instrument interface, a storage module and an RS232 interface; and each configurable control module comprises a processor module, an on-off and analog input circuit, a control signal output circuit, a low-speed CAN bus communication module and a storage unit. The invention also discloses a parameter configuration method of the system, which comprises the following steps: generating, downloading and interpreting parameter configuration files, wherein input and output signals of the passenger car body control system are set by the parameter configuration files. The invention enables the passenger car body control system to be flexible and universal and to be used on different models so as to meet different customer requirements, has the advantages of short development cycle and low development cost, and facilitates the after-sale service of the cars and the management of standby and spare parts.