Bipolar and double-liquid-injection cutting knife

The cutting knife comprises a handle, the handle comprises a hollow core rod, a sliding ring, a connecting end cap and a protective sleeve, an outer tube is fixed in the protective sleeve in a penetrating mode, the outer tube is composed of an outer tube coating and an outer tube bourdon tube, an inner tube is arranged in the outer tube bourdon tube in a penetrating mode, and the inner tube is connected with the outer tube coating in a penetrating mode. A certain gap is formed between the outer pipe and the inner pipe, the inner pipe is composed of an inner pipe coating and an inner pipe spring pipe, one end of the inner pipe is fixedly connected with a cutting knife, insulating ceramic is inserted into the outer side of the cutting knife in a penetrating mode, the insulating ceramic is inserted into one end of the outer pipe in a penetrating mode, and two water outlet holes are formed in the insulating ceramic. The electrode I and the electrode II can be respectively connected with a high-frequency electroto