Relay adhesion detection circuit

The embodiment of the invention relates to the technical field of circuit detection, and discloses a relay adhesion detection circuit, which comprises a switch control circuit, an adhesion detection circuit and a controller, the switch control circuit is connected in series between the relay and the controller; the relay is connected in series between the power supply and an external load; the adhesion detection circuit comprises a sampling circuit and an isolating circuit; the input end of the sampling circuit is connected between the relay and an external load, and the output end of the sampling circuit is connected with the input end of the sampling circuit; the output end of the sampling circuit is connected with the controller; the sampling circuit is used for sampling current flowing to an external load through the relay and inputting a sampling signal into the isolating circuit; the isolation circuit compares the sampling signal with a preset voltage value and outputs a detection signal to the controll