The invention provides a dental brace type automatic toothbrush, which comprises a handle and a U-shaped framework, the U-shaped framework is connected with the front end of the handle, and is designed according to the human periodontium, the U-shaped framework comprises an upper side, a lower side, a left side and a right side, the lower side is opposite to the upper side, the right side is opposite to the left side, a plurality of movable blocks which can move along the track of the U-shaped framework are mounted on the left side and / or the right side, and a brushing layer for brushing teeth is arranged on the surface of each movable block, which is opposite from the U-shaped framework. The brushing layers of the movable blocks can automatically reciprocate to repetitively brush teeth, and compared with the prior art, the dental brace type automatic toothbrush is highly efficient, and can quickly clean up teeth.