Abstract: An anti-theft sleeve support, including a support and an anti-theft drop pin that is connected to the support and is snapped into the sleeve corner via the support. The support includes an octagonal hollow prism with four pairs of parallel opposite sides and a base integrated with the hollow prism. The octagonal hollow prism is capable of being inserted into the square head sleeve opposite sides; and an elastic external convex body is arranged on the exterior cylindrical surface of the opposite sides III and/or the opposite sides IV. The Invention is of simple structure and is characterized in that the support cylinder is inserted into the sleeve and rotated to a certain angle, and a drop pin is inserted into the sleeve corner to secure the support for reliable anti-theft performance.