Composite tooth

The utility model discloses a composite tooth. The composite tooth comprises a tooth body and a cone-spheroid diamond layer. The tooth body comprises a spherical top, a frustum-shaped part, a bearing transition part, a cylinder, a guiding transition part and a guiding body. The guiding transition part is fixed on the guiding body. The cylinder is fixed onto the guiding transition part which is fixed onto the cylinder. One end of the frustum-shaped part is fixed onto the bearing transition part. The spherical top is fixed at the other end of the frustum-shaped part. The bearing transition part is connected with the frustum-shaped part and the cylinder in a circular and smooth mode. The cone-spheroid diamond layer covers the spherical top and the frustum-shaped part. The bearing transition part is capable of reducing internal stress of the composite tooth and enhancing bending strength of the composite tooth. The guiding body helps to avoid damage to a tooth hole when the composite tooth is pressed into the tooth hole of a drill bit so that the composite tooth does not fall down from the tooth hole.