Water pressure blasting device in large-section tunnel

The utility model discloses a water pressure blasting device in a large-section tunnel in the field of blasting devices. The water pressure blasting device comprises a shell, a pushing assembly, a filling assembly and a feeding pipeline. The feeding assembly comprises a spring, a push plate, a pull rod, a rotating shaft and a torsional spring, a first connecting rod and a second connecting rod are fixedly connected to the rotating shaft, and a wedge block is arranged on the first connecting rod; the filling assembly comprises a filling pipe, blasting materials are placed in the filling pipe, and a conveying plate is arranged in the filling pipe in a sliding fit mode. The pushing mechanism is used for pushing the conveying plate so that the conveying plate can move in the filling pipe, and the blasting materials are conveyed to the position between the pushing assembly and the feeding pipeline. A worker pulls the second connecting rod, at the moment, the wedge block moves, the push plate breaks away from limit