Passenger car safety belt lock catch with fault detection device

The invention relates to the technical field of vehicle safety belts, in particular to a passenger vehicle safety belt lock catch with a fault detection device.The passenger vehicle safety belt lock catch comprises an insertion piece, a shell, a first sensor, a second sensor, a first alarm circuit and a second alarm circuit, a lock hole is formed in the insertion piece, and an insertion groove allowing the insertion piece to be inserted is formed in the top end of the shell; a locking mechanism used for locking the insertion piece is fixedly installed in the shell. The first sensor is arranged on the locking mechanism and is used for switching on the first alarm circuit when the head end of the locking mechanism pops up to a first preset position; and the second sensor is arranged in the shell and is used for switching on the second alarm circuit when the insertion piece is inserted into the slot to a second preset position, so that the alarm is stopped when the first alarm circuit and the second alarm circui