The invention discloses an installation method for a bridge rigid hinge and belongs to the technical field of bridge construction. The installation construction method for the bridge rigid hinge includes the steps that firstly, combination and assembling are performed in advance, a running-in test is performed, and accessories are installed; secondly, preparation is performed before hoisting; thirdly, a small box girder is temporarily locked into a J2 kind end beam; fourthly, synchronous hoisting is in place, entering a preset closure gap position is achieved, and adjustment is performed properly; fifthly, a temporary locking device is installed, temporary locking is relieved, the small box girder is moved close to a J1 beam segment fixing end, and a bolt is used for connection; sixthly, a closure seam of a J2 beam segment and a J3 beam segment is forcefully adjusted, temporary fixing accessories are temporarily fixedly combined and installed, construction site connection of the J2 beam segment and the J3 beam segment is finished, and a beam is installed on the J2 beam segment; seventhly, remained facilities are installed, temporary facilities are detached, and rigid hinge supports on the periphery of the small box girder are adjusted. According to the installation method for the bridge rigid hinge, the rigid hinge and parts of the rigid hinge can be accurately and inerrably installed, the rigid hinge and a bridge are stable in structure, and safety and reliability in using the rigid hinge and the bridge are ensured.