The disclosure relates to a juice pressing device having an outer cup, an inner tank component and a juice pressing component. The inner tank has a filter grid frame and an inner tank. The filter grid frame is fixed to the bottom end of the inner tank and is communicated with the inner tank. The inner tank with the assembled filter grid frame is inserted into the outer cup and fixed at the mouth of the outer cup. The juice pressing component has a pressing piece, a pressing shaft, a sealing cover of the inner tank and a pressing movable cover. One end of the pressing shaft is connected to the pressing movable cover, and the other end is connected to the pressing piece through a through hole in the center of the sealing cover of the inner tank.