Convenient mounting and dismounting type combined prefabricated template suitable for building floor descending plate

The invention relates to a convenient mounting and dismounting type combined prefabricated template suitable for a building floor descending plate. A main body comprises a template frame formed by mutually connecting the end parts of a combined transverse steel frame plate and a vertical steel frame plate which are prefabricated by square steel plates, and limiting plug pins, a twisted steel bar serves as the limiting plug pins, interconnecting plates with limiting plug pin holes A are fixedly arranged at the two ends of the transverse steel frame plate, limiting plug pin holes B are formed inthe plate faces of the two near ends of the vertical steel frame plate, the limiting plug pins are correspondingly inserted into the limiting plug pin holes A and the limiting plug pin holes B to form a stable steel template, deformation is avoided, limiting is reliable, grout leakage can be avoided, after curing and forming, bonding and interconnection are avoided, corners of concrete are not damaged during template dis