Flame-retardant building template

The utility model relates to the technical field of building templates, in particular to a flame-retardant building template which comprises a template body. A protective structure is installed on the outer side of the formwork body and comprises a movable plate, the movable plate is arranged on the outer side of the front face of the formwork body in a sleeving mode, a movable frame is arranged on the rear side of the formwork body in a sleeving mode, and a bolt is connected between the movable plate and the movable frame in a threaded mode. And a connecting structure is installed on the protective structure and comprises a fixed plate, the fixed plate is fixedly connected to one side wall of the movable plate, an inserting block is fixedly connected to the fixed plate, and two sets of clamping blocks are movably installed on the inner side of the inserting block. The inserting blocks are inserted into the inserting grooves, the clamping blocks are clamped on the inner walls of the inserting grooves under th