Mounting process of approach bridge broken line section prefabricated part

The invention provides a mounting process of an approach bridge broken line section prefabricated part. The process comprises the steps that an approach bridge is divided into a deep water area, a mudflat area and a mangrove forest area, broken line sections are located in the mangrove forest area, prefabricated parts are installed in the deep water area through a flat crane ship, and prefabricated parts are installed in the mudflat area and the mangrove forest area in a one-way propelling mode from the sea side to the land side through a bridge erecting machine; and prefabricated beam platesin the mudflat area and the mangrove forest area are hoisted, the prefabricated parts are hoisted from a beam transporting barge to a beam transporting flatcar by using a flat crane ship, the beam transporting flatcar transports the prefabricated parts to the position of a bridge girder erection machine through a rail installed on the approach bridge, and the bridge girder erection machine carriesout broken line section p