Mounting structure of chain box of motorcycle

The utility model relates to the technical field of motorcycle chain boxes, and provides a motorcycle chain box mounting structure which comprises an upper chain box and a lower chain box, positioning columns are arranged at the lower end of the upper chain box, positioning holes are formed in the upper end of the lower chain box, upper fixing plates are symmetrically arranged on the two sides of the upper chain box, and lower fixing plates are symmetrically arranged on the two sides of the lower chain box. A pressing assembly is arranged on the upper fixing plate and comprises a lifting rod, the lifting rod linearly moves in a reciprocating mode in the vertical direction, a rotatable locking block is arranged at the bottom end of the lifting rod, and an oil injection hole is formed in the end of the upper chain box. The upper chain box and the lower chain box are relatively rapidly installed together through the lifting rod and the locking block, a chain is protected, soil is prevented from entering the chai