The utility model relates to an elbow type adjustable toothbrush. A toothbrush top is connected with a toothbrush handle by an adjustable bolt; the toothbrush hair equipped at one side of the toothbrush top is paralleled with the side of the toothbrush handle, and another side toothbrush hair is paralelled with the upper side of the toothbrush handle. When brushing the inner face of the teeth, the toothbrush handle is held by the right hand, and the toothbrush top is turned to the left of the toothbrush handle; the toothbrush handle is held by the left hand, and the toothbrush top is turned to the right of the toothbrush handle. The toothbrush can be adjusted by the elbow, which makes the contact angle of the toothbrush hair and the teeth be more reasonable; the tooth brushing is clean. The utility model has simple structure and easy use.