The invention discloses a water purification cup. A pushing block is pushed to a second fixing block through a pushing device, then a filter screen is driven to pass through a fourth track and a first track by using a driving device and ascends to filter the water poured between an inner cup body and an outer cup body, then a motor drives a rotating disc to drive a rotating cup wall to rotate, make the cup wall provided with a through hole exposed out of the through hole and make the inner cup body and the outer cup body communicated, the water can enter the inner cup body through the through hole, then a downward pressing device drives a rotating shaft and a downward pressing block to make the front end of the downward pressing block enter a second track on the outer wall of the inner cup body and press down the downward pressing block, the water between the inner cup body and the outer cup body is wholly pressed into the inner cup, then the motor drives the rotating disc to drive the rotating cup wall to rotate to an original position and cover the through hole formed in the cup wall provided with the through hole, so that filtered water wholly enters the inner cup body, and the water purification cup is very simple and convenient.