External wet clutch of dynamic compaction main winch speed reducer

The invention discloses an external wet clutch of a dynamic compaction main winch speed reducer. The external wet clutch comprises a shaft neck section of a clutch driving hub installed in a cylindrical cavity of a bearing receiving plate. The front end of the bearing receiving plate is combined with a main winch speed reducer winding drum, and the rear end of the bearing receiving plate is combined with a clutch gear ring through a supporting annular plate. The clutch gear ring and a gear at the back of the clutch driving hub are engaged through a clutch assembly, and the clutch assembly is composed of annular steel sheets and annular friction plates which are arranged at intervals. A piston, a piston baffle and a clutch outer plate package fixedly connected with the rear end of the clutch gear ring are installed at the back of the clutch assembly. The piston and the piston baffle are coaxially arranged together in a sleeved mode, a hydraulic oil cavity is formed between matched stepped table facets of the piston and the piston baffle and communicated with a rotary joint through an oil passage, and the joint is connected with a hydraulic oil source. The heat dissipation effect can be effectively improved, the service life of the clutch can be effectively prolonged, and when vulnerable parts of the clutch are damaged, the maintainability of the clutch is effectively improved.