The invention discloses a CAN control module of a triple-axle passenger car. The CAN control module comprises a third axle hoisting control module, a third axle following control module, a driving axle pressure detection module, a car speed detection module, a driving axle ASR detection module, a back motion signal detection module, a generator signal detection module and a start-shutdown detection module. The third axle hoisting control module is used for controlling a third axle to be hoisted or forbidding the third axle from being hoisted; the third axle following control module is used for controlling the third axle to follow or locking following of the third axle; the driving axle pressure detection module detects an axle pressure signal of a driving axle; the car speed detection module detects the speed of the passenger car; the driving axle ASR detection module detects whether an ASR of the driving axle works or not; the back motion signal detection module detects whether a passenger car makes back motion or not; the generator signal detection module detects whether a generator works or not; and the start-shutdown detection module detects a start-shutdown signal for indicating the third axle to work.