Self-checking password switch

The invention relates to a self-checking password switch. The self-checking password switch comprises a password lock part and a switch part, wherein the password lock part is fixedly connected with the switch part. A key is matched with a lock cylinder, the key and three password turntables are combined to control a clamping column c and a cover to be locked and bounced off, and thus an integralpassword lock function is realized. A mechanism in the switch part can control a power-on switch, and a detection mechanism is arranged in the switch part. When the detection mechanism detects that water enters the switch or the concentration of coal gas is too high, a main circuit is powered off. Thus, the anti-creeping and anti-explosion effects are integrally realized. The self-checking password switch is safe and reliable and is prevented from being controlled by other professionals. The self-checking password switch has a self-checking function, so that short circuit and explosion are prevented, and the safety is