Cement negative pressure screen analysis instrument and use method

The invention relates to the technical field of cement negative-pressure screen analysis instruments, and provides a cement negative-pressure screen analysis instrument and a using method thereof, and the cement negative-pressure screen analysis instrument comprises a box body, a cleaning mechanism and a fixing mechanism. The cleaning mechanism is arranged, a first motor rotates anticlockwise to drive a screen cover to move upwards, the effect of opening the screen cover is achieved, a weighed cement sample is placed in a screen, the first motor rotates clockwise to enable the screen cover to descend and keep closed, a second motor drives a first brush plate and a second brush plate to rotate, and the cement sample is cleaned. Cement adhering to the surface of the screen cover in the screen analysis process is scraped, the effect of automatically scraping the cement is achieved, meanwhile, a second brush plate can stir the cement in the screen, the screen is prevented from being blocked, the cement on the sur