The invention relates to the technical field of automobile CAN bus communication, and provides CAN based vehicle-mounted equipment reminding device and method. The CAN based vehicle-mounted equipment reminding device is simple in structure, low in cost, high in interference resistance and free of power consumption. The CAN based vehicle-mounted equipment reminding device comprises a CAN bus of an automobile (Electronic Control Unit), a vehicle-mounted equipment power management CPU, an automobile electric door ACC detection circuit, a CAN bus detection reminding sending module; the CAN bus detection reminding sending module comprises an infrared emitting diode, four resistors and two capacitors; the automobile electric door ACC detection circuit is connected with the input end of the vehicle-mounted equipment power management CPU; the vehicle-mounted equipment power management CPU determines and controls automobile vehicle-mounted equipment to be started/ stopped according to the output information of the automobile electric door ACC detection circuit and the CAN bus detection reminding sending module.