Tower crane stock mechanism

The utility model discloses a stock mechanism of a tower crane, which belongs to the technical field of tower cranes and comprises a first support frame and a second support frame, first straight plates are fixed on two sides of the bottom end of the first support frame, and second straight plates are fixed on two sides of the top end of the second support frame. A bolt is connected to the first straight plate, a first groove is formed in the bottom end of the first straight plate, a clamping groove is formed in the top end of the second straight plate, a round block is arranged on the outer side of the second straight plate, a moving rod is arranged in the first groove, a bearing is fixed to one end of the moving rod, a clamping block is fixed to the other end of the moving rod, the bearing is connected with one end of the bolt, and a second groove is formed in the side face of the clamping block; a third groove is formed in the side wall of the clamping groove, a notch is formed in the third groove, a round