The invention discloses a construction method for abutment lap joint of a bridge rigid framework. The method is characterized by comprising the following steps of (a) processing and preparing pressure-weight flatbed trucks, temporary rails, rail car bumpers, traction devices and traction steel wire ropes; (b) symmetrically installing the pressure-weight flatbed truck temporary rails, the rail carbumpers, the traction devices and the traction steel wire ropes on bridge decks of the upper portions of two piers to form a pressure weight device; (c) in the construction process, when the pressure-weight flatbed trucks are synchronously pulled to the abutment lap joint ends of the rigid framework respectively, constructing the abutment lap joint ends of the rigid framework, and namely conducting concrete casting forming construction on the abutment lap joint ends before the construction of a closed section. The construction method facilitates the abutment lap-joint pressure weight design and construction on the bridge rigid framework.