The invention discloses a hydraulic pulper. The hydraulic pulper comprises a tank body, rotors, a screen plate, a bracket, a first support column and a second support column, wherein the screen plate is positioned at the lower end of the tank body, and is used for supporting the tank body; a material dropping opening and a water spray pipe are arranged at the top part of the tank body, the bottom part of the tank body is provided with a slag outlet and a pulp outlet, the slag outlet is positioned above the screen plate, and the pulp outlet is positioned under the screen plate; the cross section of the tank body is in a splay shape, and the tank body comprises a first cavity and a second cavity; the first support column is arranged in the middle of the first cavity, and the second support column is arranged in the middle of the second cavity; the rotors comprise a first rotor and a second rotor, motors are respectively arranged at the lower parts of the first rotor and the second rotor, and the rotation directions of the two motors are opposite; the first rotor is sheathed on the first support column, the second rotor is sheathed on the second support column, and the first rotor and the second rotor are not positioned on the same horizontal surface. Compared with the prior art, the hydraulic pulper has the advantages that the dead corner is avoided, the utilization rate of energy is higher, and the pulping efficiency is higher.