Medicine interventional therapy device for digestive oncology department and use method of medicine interventional therapy device

The invention provides a digestive oncology medicine interventional therapy device and a use method, the digestive oncology medicine interventional therapy device comprises a positioning assembly, the positioning assembly comprises a fixing plate, a lifting plate, an adjusting plate, two fixing columns, a fixing ring, a sleeve, three infrared sighting devices, a first screw rod, a limiting column, a supporting block, a first magnetic block, a second magnetic block, a spring and an injection tube; and the bottom end of the first screw rod sequentially penetrates through the lower surface of the fixed plate and the lower surface of the lifting plate. A limiting column is pushed downwards through a first screw rod, the limiting column pushes a fixing column through a lifting plate, a sleeve pushes an injection needle to vertically move downwards, then a needle head of the injection needle penetrates into the body of a patient, a first magnetic block and a second magnetic block are attracted, the first screw rod