Packing box facilitating replacement of packing

A packing box facilitating replacement of packing mainly solves the problem that packing of an existing packing box is difficult to replace. The packing box is characterized in that the shape of the inner hole of a packing cylinder (1) is a big-end-up cone, the shape of each bushing (2) is a semi-circle, semi-circular bosses (3) are arranged in the bushings (2), the packing is placed between the two bosses (3), the two bushings (2) form a big-end-up cone matched with the inner hole of the packing cylinder (1) and are placed in the inner hole of the packing cylinder (1), threaded holes are formed in the upper ends of the bushings (2) in the axial direction, screws (4) are connected into the threaded holes, and the packing cylinder (1) is connected with a pressing cap (5). The packing box facilitating replacement of the packing has the advantage that replacement of the packing is convenient and fast.