Detachable supporting device for installation of reinforcement cage

The utility model relates to a detachable supporting device for installation of a reinforcement cage, which comprises an in-ring supporting piece, a plurality of supporting parts and a plurality of supporting parts, wherein the in-ring supporting piece is provided with a plurality of supporting parts; the multiple reinforcement cage abutting pieces correspond to the supporting parts in a one-to-one mode. And at least one supporting part is connected with the corresponding reinforcement cage abutting piece through a length adjusting assembly, the length adjusting assembly is used for adjusting the distance between the supporting part and the reinforcement cage abutting piece, and the other supporting parts are directly connected with the corresponding reinforcement cage abutting pieces. During installation, the in-ring supporting pieces with the reinforcement cage abutting pieces are placed in the reinforcement cage, then the length adjusting assemblies are adjusted, the corresponding reinforcement cage abutti