Crushing mechanism and underwater crushing platform

The utility model provides a crushing mechanism and underwater crushing platform, including mechanism shell, roll saw rock opener and hob crushing wheel, roll saw rock opener and hob crushing wheel are respectively provided in the mechanism shell, roll saw rock opener is provided at the one end of the crushing mechanism in the advancing direction, hob crushing wheel is provided in the mechanism shell, and hob crushing wheel is provided in the mechanism shell in the advancing direction. The rolling saw rock cutting device comprises a plurality of sawtooth blades and a first rotating shaft, the sawtooth blades are arranged on the first rotating shaft at intervals and fixedly connected with the first rotating shaft, the first rotating shaft drives the sawtooth blades to rotate, and the hob crushing wheel is arranged behind the rolling saw rock cutting device. The hobbing cutter crushing wheel comprises a second rotating shaft and a plurality of hobbing cutters arranged on the second rotating shaft, the hobbing c