Plastic top edge beam mounting structure, mounting method and automobile

The invention relates to a plastic top edge beam mounting structure and method and an automobile, the plastic top edge beam mounting structure comprises a plastic top edge beam, a roof metal plate and an automobile body side wall, the plastic top edge beam is arranged on the outer side of an automobile body top cover edge beam, and the plastic top edge beam mounting structure is characterized in that the roof metal plate is provided with at least one first clamping piece; the clamping piece is inserted into a first clamping hole formed in the top cover assembling side of the plastic top edge beam so that the plastic top edge beam and the car roof metal plate can be clamped and fixed, the other side of the plastic top edge beam serves as the side wall assembling side and is provided with a clamping piece, the clamping piece is provided with at least one second clamping hole, and the clamping piece is clamped and fixed to the second clamping piece through the second clamping hole. By the adoption of the mountin