The invention discloses a semiconductor resistor. The semiconductor resistor comprises an N-type substrate, a P-type grid, a P-type source, a P-type drain, an N-type doping region and a metal connection line, wherein the P-type grid is formed on the N-type substrate, the P-type source and the P-type drain are formed at two sides of the P-type grid and are arranged in the N-type substrate, the N-type doping region is formed in the N-type substrate and is close to the P-type source, the metal connection is connected to the N-type doping region, the P-type source and the P-type grid, the N-type doping region, the P-type source and the P-type grid form one end of the semiconductor resistor, and the P-type drain forms the other end of the semiconductor resistor. In the semiconductor resistor disclosed by the invention, no extra functional module is arranged to apply voltage so that the semiconductor conductor has an effect of an equivalent resistor, a P-type conductive channel is not needed to be arranged between the source and the drain, the structure and the fabrication process of the semiconductor resistor are simplified, and the cost is reduced.