As one of the most basic geometric quantities, the accuracy of angle directly affects the product quality of manufacturing industry. Aiming at the technical bottleneck that the number of scribed lines of grating sensor is difficult to be further improved, an angle sensor measurement system based on pyramid is proposed in this paper. Through the regular pyramid reflection structure, multiple laser beams are incident on the regular pyramid prism at 45°, and combined with multiple position sensitive detectors set in dislocation, the continuous measurement of angle is realized. The experimental results show that the principle of the angle sensor based on pyramid is correct. Within the range of 1.2°, the measurement error of a single position sensitive detector is ±3.5″; When four position sensitive detectors measure continuously and alternately, the measurement error is ±4″ within the range of 4.8°. The pyramid angle sensor proposed in this paper does not need grid scribing, and the accuracy is related to the distance of the position sensitive detector and its measurement accuracy. With the improvement of the accuracy of the position sensitive detector, the measurement accuracy of the system is bound to be further improved.