The invention discloses a deformable and expandable dental implant. The dental implant includes: a columnar foundation pile central body, the side of which is equipped with a plurality of mounting grooves and clamp claw holding grooves, wherein the mounting grooves extend along a generating line direction, and the clamp claw holding grooves are communicated with and perpendicular to the mounting grooves; clamp claws, which are overall arc-shaped, and each of which includes an outer arc edge, an inner arc edge, a connecting end and a tip, wherein the connecting end is hinged into the clamp clawholding grooves through a rotating shaft, and the outer arc edge is close to the bottoms of the clamp claw holding grooves; a cylindric foundation pile shell, which has an inner diameter fitting theouter diameter of the foundation pile central body, is equipped with bumps on the inner wall, and is also provided with a movable port that is located beside the bumps and parallel to the clamp claw holding grooves and can let clamp claws stretch out and pass through, wherein the bumps fit the mounting grooves and clamp claw holding grooves in terms of size and are provided with work surfaces compressing the outer arc edges of the clamp claws; and locating pins, which are inserted into the mounting grooves and also compress the foundation pile central body and the foundation pile shell simultaneously.