Degassing device and degassing method in lubricating grease production kettle

The invention provides a degassing device and method in a lubricating grease production kettle. The device comprises a lubricating grease production kettle body, a stirring device and a vacuum pump unit. The lubricating grease production kettle body comprises a kettle barrel body, an end socket, a negative pressure pumping port, a jacket and a rack, the stirring device comprises a motor, a stirring shaft, a speed reducer and a helical ribbon stirrer, and the vacuum pump unit comprises a vacuum pipeline, a vacuum pipeline control valve, a first exhaust pipeline, a second exhaust pipeline, a vacuum buffer tank and a vacuum pump. Negative pressure of the kettle body of the lubricating grease production kettle is pumped through a vacuum pump of the vacuum pump set, lubricating grease is continuously stirred up and down through a helical ribbon stirrer of the stirring device, bubbles in the lubricating grease are discharged in an explosion mode under the pressure difference effect, and finally the bubbles are disc