Supporting device based on diversion tunnel construction

The invention relates to the technical field of tunnel supporting and particularly discloses a supporting device based on diversion tunnel construction. The supporting device comprises a door-shaped frame located in a tunnel and a supporting mechanism arranged on the door-shaped frame, and the supporting mechanism comprises a first-stage supporting structure and a second-stage supporting structure; the first-stage supporting structure comprises a top plate, a lifting assembly and a locking assembly, the lifting assembly is used for driving the top plate to stretch out and draw back on the upper portion of the door-shaped frame, and the locking assembly is used for locking and supporting the top plate; according to the scheme, the multi-stage supporting mechanism is introduced, multi-stage supporting is conducted on the water diversion tunnel, that is, a more complete supporting net is formed through mutual complementation of the first-stage supporting structure and the second-stage supporting structure, and t