Hydraulic collapsible fishing barrel is used for fishing cylindrical fish. When operating, put the tool into the position of falling fish, press down a certain weight, and then lift the tool to fish out. If the falling fish is stuck and can not be lifted out directly, the fishing barrel needs to be released from the falling fish, just start the pump for circulation, the throttling pressure difference in the pipe column, the fishing barrel can be released. Various specifications of the socket are equipped with a series of high hardness claws.