A rotating cup, both hands implement relatively forward and backward rotation to generate agitation effect, for mixing powdered material with liquid and stirring food material, such as egg liquid, especially suitable for the open air. The rotating cup comprises an inner cup, a first outer cup and a second outer cup which are coaxially superposed. A fixed axle penetrates through the center of circle of the first outer cup, and both ends of the fixed axle are fixed to the centers of circle of inner cup and the second outer cup, so that the second outer cup and inner cup are interlocked, and the first outer cup can idle. The rotating cup can be equipped with a transmission structure and a stirring rod simultaneously or respectively. On the one hand to provide unidirectional rotation effect and acceleration effect for quick mixing, on the other hand to provide a better agitation effect.