The invention discloses a door lock state detecting device. The door lock state detecting device comprises an induction switch, a bracket, an air cylinder, a piston rod, a microprocessor and a warning indicator. The induction switch is electrically connected with the microprocessor. The bracket is fixed to a door leaf. The air cylinder is arranged on the bracket, is connected with the signal end of the microprocessor, and comprises an air cylinder body and a piston arranged in the air cylinder body. The piston rod penetrates through the air cylinder body, and the tail of the piston rod is connected with the piston. The head of the piston rod faces towards a door frame and abuts against the door frame when the door leaf is closed. The warning indicator is connected with the signal end of the microprocessor. Compared with the prior art, the door lock state detecting device uses the air cylinder on the door leaf and the piston rod perpendicular to the door frame, so that the air cylinder drives the piston rod to apply the acting force to the door frame when the door leaf is closed, then under the counter force of the door frame, the door leaf in a false locking state is pushed open, and a warning signal is sent out.