Water floating tank for planting rice and water planting method of rice

The invention relates to a water floating tank for planting rice. The water floating tank for planting rice is a box body which is composed of a box bottom (1) and a lateral wall (2) of which the lower edge is connected with the periphery of the box bottom (1) and can bear load to float on the water, wherein the box bottom (1) and the lateral wall (2) are respectively composed of surrounding layers (11 and 21) and buoyancy plates (12 and 22); the surrounding layers (11 and 21) can penetrate water and gas and cannot penetrate soil; and the buoyancy plates (12 and 22) are coated inside the surrounding layers (11 and 21) and can bear load to float on the water. According to the water planting method of rice, the water floating tank for planting rice is adopted as a rice planting carrier; the water floating tank has the advantages that the water floating tank saves land resources, and saves manpower, material resources and time. By adopting the method, the rice can be planted in water in a natural water area; the floating tank floats on the water and fluctuates along with the water surface when the water level changes; normal growth of the rice inside the floating tank is not affected; the processes such as ground planting soaking and draining are removed; the method is simpler; and management and maintenance are more convenient.