Sealing structure of piston type compressor

The utility model discloses a piston type compressor sealing structure which comprises a piston rod, a packing box, a box cover and a box bottom, the box cover and the box bottom are respectively installed at two ends of the packing box, the piston rod sequentially penetrates through the box cover, the packing box and the box bottom, and a limiting hole is formed in the outer wall of the piston rod. A cavity is formed in the box cover, a first elastic piece and a limiting block are arranged in the cavity, the first elastic piece is used for pushing the limiting block to be inserted into the limiting hole, the box cover is further provided with a first channel used for introducing a cooling medium, and the first channel is communicated with the cavity; a radiating pipe penetrating through the packing box is also arranged in the packing box; a movable part connected with the limiting block is further arranged in the cavity of the box cover, and the heat dissipation medium in the first channel can drive the mova