Abstract: A rotary liquid-supplying cultivation device for plant growth is provided, which includes a box body provided with a water tank, a liquid supply device and a rotating device. A fill lamp is connected with an inner wall of the box body. The liquid supply device includes a liquid supply pipe, a solenoid valve, a sleeve, a first spring, a bushing, a metal pipe, a cannula and a cultivation basin. An end of the liquid supply pipe is inserted in the water tank; a limiting block is arranged in the sleeve and slidably matched with an inner wall of the sleeve; two ends of the first spring are respectively connected with the limiting block and the bushing. The rotating device includes a turntable on which the cultivation basin is arranged, a transmission rod coaxially connected with the metal tube and a driving mechanism configured to drive the transmission rod to rotate.