The invention provides a static chuck and a semiconductor device. A supporting assembly comprises a base and a function portion, a chuck body is fixed to the base through a fastener and comprises a main body portion, the surface, deviating from the base, of the main body portion is provided with a convex portion, and the upper surface of the convex portion is used for supporting a workpiece to bemachined. The surface, facing the base, of the main body portion is provided with a concave portion, and the space composed of the concave portion and the base is used for accommodating the function portion and a pipeline connected with the function portion. The structural strength of the chuck body is improved, the situations of non-thorough sintering, ceramic particle size nonuniformity and theinfluence on the strength and mechanical property of the chuck body are avoided, diffusion of tiny cracks can be effectively prevented, and the breakage strength of the chuck body is improved so thatthe strength of the chuck body can reach the shear force resisting strength.