Locking device of stair formwork for building construction

The utility model discloses a locking device of a stair formwork for building construction, and belongs to the field of formwork locking devices. The locking device of the stair formwork for building construction comprises a telescopic frame, end connecting pieces and pressing devices, the end connecting pieces are hinged to the two ends of the telescopic frame respectively, and the pressing devices are hinged to the end points of the upper side and the lower side of the telescopic frame. The problems that existing locking pieces are arranged singly and need to be installed one by one during use, the working efficiency is influenced, the tightness and the position interval during installation need to be manually controlled, the locking pieces at different positions are prone to exerting different pressure on a stair formwork, and use of the stair formwork is influenced to a certain degree are solved. The pressing devices which are symmetrically distributed up and down are connected through the telescopic fram