Roof smoke cap prefabricated formwork system device

The invention discloses a roof smoke cap prefabricated formwork system device in the technical field of building molds, a positioning handle is slidably connected with a limiting column, the lower end of the limiting column is fixedly connected to the upper portion of a bottom plate, the outer wall of the limiting column is connected with a first spring in a sleeving mode, a closing assembly is arranged on the rear portion of a fixed formwork, and the upper portion of the closing assembly is fixedly connected with a movable formwork; the closing assembly is used for controlling closing of the movable mold plate, the trowelling assembly is arranged on the right side of the fixed mold plate and used for trowelling mortar overflowing from the movable mold plate, the inserting-connecting assemblies are arranged on the left side and the right side of the bottom plate correspondingly and used for feeding, and by arranging the closing assembly, workers can rapidly align and clamp the movable mold plate to the fixed