Power supply anti-reverse connection circuit of on-vehicle electric apparatus

The utility model discloses a power supply anti-reverse connection circuit of an on-vehicle electric apparatus, which relates to the technical field of power supply protection circuits. The circuit comprises a switch circuit adopting a field effect transistor to control a power supply BATT+, as well as a shutoff switch circuit and a turn-on switch circuit, wherein the shutoff switch circuit and the turn-on switch circuit are connected with the switch circuit; and the switch circuit, the turn-on switch circuit and the shutoff switch circuit form the power supply anti-reverse connection circuit of the on-vehicle electric apparatus to be connected between the power supply BATT+ and a ground wire. The power supply anti-reverse connection circuit of on-vehicle electric apparatus has the benefits of simple circuit design, and capability of effectively avoiding damage to post-stage circuits caused by the reverse connection of power supply poles.