Water bag type concrete project deformation joint water stopping cavity die

The utility model relates to a water bag type concrete project deformation joint water stopping cavity die which comprises a framework and a water bag. The water bag is connected with the framework and disposed on the outer side of the framework. When the cavity die is used, the framework is connected with a water stopping piece embedded in a first-stage concrete section, the water bag is filled with water, second-stage concrete is poured, the water in the water bag is released after the initial setting of the second-stage concrete, the framework and the water bag are removed to form a semicircular cavity allowing molten asphalt to be injected in a second-stage concrete section, and water stopping can be achieved by injecting the molten asphalt into the cavity. By the water bag type concrete project deformation joint water stopping cavity die which is reusable, the problem of deformation joint water seeping, caused by uneven stratum settlement or stratum dislocation, of water conservancy projects can be solved.