Extension device based on multi-purpose vehicle-mounted unit monitoring execution

The utility model relates to an extension device based on multi-purpose vehicle-mounted unit monitoring execution, which comprises a microprocessor unit (1), a signal collecting module (2), a control output module (3), a CAN control module (6) and a power supply module (4), wherein the microprocessor unit (1) is connected with a vehicle-mounted unit host (5) through the CAN control module (6), connected with the signal collecting module (2) through a port and connected with the control output module (3) through a port. The vehicle-mounted unit host is connected with the extension device for realizing the communication between the extension and a control center and the collection and control of vehicle-related signals and providing the information such as the operating modes of vehicles, the image monitoring of vehicles and the like.