The invention relates to the technical field of manufacturing of prefabricated members for bridge and tunnel buildings. A steam shed for hardening of a concrete prefabricated bridge plate comprises two parallel grade beams, a plurality of shed bones which are distributed in the extending directions of the grade beams and shed cloth which is fixed to the shed bones. One end of each shed bone is hinged to one grade beam through a hinged shaft, an arc-shaped connector with the corresponding hinged shaft as a circle center is arranged at the other end of the shed bone, the other grade beam is provided with arc-shaped connection holes with the corresponding hinged shafts as circle centers, and the connectors can be inserted into the corresponding connection holes in a pull-out manner. The steam shed for hardening of the concrete prefabricated bridge plate can increase the hardening speed of the concrete prefabricated bridge plate, and solves the problem that the hardening speed of the concrete prefabricated bridge plate is low in the manufacturing process.