Non contact angle measurement is widely used in machinery manufacturing,high precision measurement,aerospace and other fields.In a high speed galvanometer two dimensional angle measurement device,a large range (±10°),high rate (80 kHz),and high precision non contact two dimensional angle measurement method is required.The traditional dynamic angle measurement method cannot meet the requirements.Based on the high speed response characteristics of PSD,a photoelectric high precision non contact two dimensional dynamic angle measurement system is designed,which can achieve better measurement performance.First,the use of high precision PSD detectors and lasers and other optical devices can achieve high precision and large wide non contact two dimensional angle measurement；in addition,the relationship between 2D mechanical angle and 2D displacement of PSD is obtained by coordinate system transformation,and a high speed data sampling through FPGA and high speed AD acquisition board is achieved.The use of digital filtering greatly reduces the noise of the system；through the method of data interpolation,the measurement data is corrected,which greatly reduces the error of the system.The system error of large scale two dimensional angle is at a low level.Through experimental testing,the system can achieve ±10° swing angle measurement,the sampling frequency can reach 125 kHz,the noise and resolution can reach 0.001°,and the maximum system error is 0.007°.It meets the requirements of large range,high speed and high precision angle measurement.