Automobile B-pillar mounting structure

The utility model relates to the technical field of automobile parts, and discloses an automobile B column mounting structure. The automobile B column mounting structure comprises an automobile B column body, mounting assemblies are arranged at the two ends of the automobile B column body, and a side top beam assembly is connected to the top end of the automobile B column body. By arranging the clamping plate, the clamping groove, the mounting plate and the auxiliary block, the automobile B column main body is clamped between the side top beam assembly and the doorsill beam assembly, the auxiliary block pushes the clamping plate to movably move upwards on the inner side of the movable groove and stretch out to be inserted into the clamping groove in the inner side of the side top beam assembly and the inner side of the doorsill beam assembly, and after being inserted, the automobile B column main body is clamped between the side top beam assembly and the doorsill beam assembly. Two groups of bolts penetrate t