Power source module of electronic parking brake system

The invention discloses a power source module of an electronic parking brake system. The power source module of the electronic parking brake system comprises a vehicle-mounted power source, a left motor power supply, a right motor power supply, a reverse protective module A, a reverse protective module B, a surge protective module, a switch control module, a car ignition switch, a DC-DC voltage reduction and stabilization module A, a DC-DC voltage reduction and stabilization module B, an MCU mainframe control module, a MCU slave control module, a watchdog module and other module power supplies. The power source module of the electronic parking brake system has the functions of reverse protection, surge protection, under-voltage protection, switch controllability, switch self-locking, switch self-off energy conservation, fault automatic power-off protection of the electronic parking brake system, self-monitoring of the electronic parking brake system and the like, and is reasonable in structure.