In siphon scraper centrifuge, the filtrate is discharged from the drainage tank 6 on the back of the drum through a tangential arranged discharge pipe which can move} ` n} J. Control the radial height between the liquid level 5 and the filter screen I to make the liquid outside the filter screen produce the pressure difference of automatic discharge. It is similar to the siphon phenomenon in gravity field. The difference is that under the action of centrifugal force field. The pressure difference should be calculated according to the centrifugal force field. The siphon force produces negative pressure suction on the material in the filter screen, which increases the driving force of filtration and the number of separation cells. A kind of intermittent operation filter centrifuge with application of suction principle to increase filtrate passing through filter cake to strengthen separation process. The principle is shown in the figure. The filtrate is discharged from the drainage tank 6 at the back of the drum through a tangential arranged drain pipe which can move} ` n} J. Control the radial height between the liquid level 5 and the filter screen I to make the liquid outside the filter screen produce the pressure difference of automatic discharge. It is similar to the siphon phenomenon in gravity field. The difference is that under the action of centrifugal force field. The pressure difference should be calculated according to the centrifugal force field. The siphon force produces negative pressure suction on the material in the filter screen, which increases the driving force of filtration and the number of separation cells. Compared with other centrifuges with the same speed and diameter, the drum structure determines that it can only use intermittent operation and scraper discharge. The discharge pipe can move and adjust the liquid level s during operation to backwash the filter screen and filter cloth.