The utility model relates to a tool for testing the full-life-cycle pressure of a lithium ion battery. The method is characterized in that the method is characterized by comprising the following steps; the device comprises a bottom plate, a sliding pressing plate, a sensor fixing plate, a sensor, a limiting column, a supporting plate and a speed reduction lifting transmission mechanism. Limiting columns are symmetrically and fixedly connected to the bottom plate and slidably connected with the sliding pressing plate and the sensor fixing plate, a supporting plate is fixedly connected to the top ends of the limiting columns, a speed reduction lifting transmission mechanism is fixedly connected to the supporting plate, the front end of the speed reduction lifting transmission mechanism is fixedly connected with the upper surface of the sensor fixing plate, and a sensor is fixedly connected to the lower surface of the sensor fixing plate. The beneficial effects of the utility model are that the sensor on the test tool can be connected with the data collector, and after a fixed pre-tightening force is applied to a tested sample, the change of a real-time pressure value of the tested sample is tested.