The invention discloses a mechanical drive type centrifugal filtration separating tank which comprises a filter tank body, a rotary cover and filtering nets, wherein a sealing cover is connected to the top of the filter tank body; the upper end of the sealing cover is connected with a feed liquid pipe I and a feed liquid pipe II; a mechanical seal is arranged in the middle of the top end of the sealing cover; a rotating shaft is arranged in the mechanical seal in a penetrating manner; an air guide sleeve is arranged inside the top end of the filter tank body; the bottom of the air guide sleeveis connected with the rotary cover; the bottom of the rotary cover is connected with a plurality of diagonal bars; a filtering net is paved between two adjacent diagonal bars; and under drive of a motor I, mixing blades, a dispersing rod and a dispersing head on the motor are driven to fully mix the feed liquid by the rotating shaft, and the rotary cover and the filtering nets are driven to rotate under mechanical drive of a motor II. The mixed feed liquid is subjected to centrifugal filtration separating, impurities are discharged by a blow-off pipe, the feed liquid is collected by the collecting hood and then discharged from a liquid outlet, the efficiency and effect of fully mixing the two kinds of feed liquid are improved, separation of the impurities from the feed liquid is realizedwhile centrifugal filtration is realized, and the operation is convenient and rapid.