High top cover structure of commercial vehicle cab

The invention discloses a high top cover structure of a commercial vehicle cab, which belongs to the technical field of commercial vehicle cabs and comprises a top cover outer plate, a top cover reinforcing beam, a top cover base, an air window upper framework, a side wall top cover front mounting bracket, a side wall top cover rear mounting bracket and a rear wall top cover mounting plane. The lower portion of the top cover reinforcing beam is connected with the upper portion of the top cover base, the top cover outer plate is installed on the outer side of the top cover reinforcing beam in a buckled mode, the periphery of the lower portion of the top cover base is supported and installed through the air window upper framework, the side wall top cover front installation support, the side wall top cover rear installation support and the rear wall top cover installation plane, and glue is arranged between the top cover base and a gap in the upper side of a cab. On the basis of a side wall and a rear wall of a