The invention provides an innovative garbage bag breaking device which comprises a fixed steel plate and a hydraulic assembly located on one side of the steel plate. A plurality of rows of steel cones are distributed on the steel plate. The hydraulic assembly comprises a hydraulic transmission box and a plurality of hydraulic steel pipes stretching out from the bottom of the side, close to the steel plate, of the box, and each hydraulic steel pipe is located between the corresponding two adjacent rows of steel cones. According to the innovative garbage bag breaking device, garbage is placed underwater, and spreading of odor in the air is isolated. Meanwhile, hooking and kicking type bag breaking is carried out through relative movement between the hydraulic steel pipes and the steel cones, bags can be quickly broken, garbage materials are not tangled, and work efficiency is high. In addition, the underwater bag breaking device achieves the purpose of breaking the bags without damaging garbage components and avoids the dust raising phenomenon in the garbage disposal process at the same time, garbage is classified and disposed, environment friendliness and practicability are achieved, and the novel garbage disposal idea of the current society is completely met.