A vehicle suspension frame locking device comprises a two-rod mechanism that consists of an interlocking outer arm and a connection rod which are hinged together; one end of the connection rod is provided with a vehicle bridge connection seat; the other end of the interlocking outer arm is fixedly connected with the interlocking shaft arranged at the frame; a stop mechanism which controls the motion of the two-rod mechanism is arranged at the frame; the end part of a slide block is provided with a reciprocating drive mechanism. The vehicle suspension frame locking device is mainly used for the vehicle suspension frame.