Fastening device for building template

The utility model discloses a fastening device for a building template, which relates to the technical field of building reinforcement and comprises a rod body and a mounting sleeve fixedly sleeved on the rod body. Through the arrangement of the mounting frame, the reinforcing ribs, the rubber pads, the connecting plates, the sliding sleeves, the clamping plates, the supporting rods, the butt joint plates, the screws, the sleeves, the inserting columns, the springs and the inserting grooves, the reinforcing ribs and the supporting rods enable the mounting frame to be more stable when the building formwork is supported, and the situation that the mounting frame and the clamping plates deform due to force when the building formwork is supported is avoided; therefore, the fastening effect is influenced; the two rubber pads can enable the mounting frame and the clamping plate to be more attached to the building formwork, the friction degree between the mounting frame and the clamping plate and the building formwo