Aiming at the problems of complex light path and high price of laser triangulation ranging equipment with high precision and large measurement range,which has a small range when the traditional CCD linear array sensor is used for high-precision triangulation ranging,this paper designs a long-distance,sub millimeter precision and moderate structural size triangulation ranging system.The system uses XC2C64A-5QFG48C as the main control chip to drive the CCD linear array sensor,and uses the A/D module and DMA channel in the single chip microcomputer STM32F103C8T6 to complete the synchronous acquisition and high-speed transmission of the CCD output signal.At the same time,by simulating the actual measurement environment and building a mathematical model of the device,the construction of the ranging system is completed.Finally,the system is verified by experiments.The results show that the system works stably,and can achieve sub millimeter precision distance measurement from 600 mm to 800 mm.While ensuring the measurement accuracy,it expands the range of the system,and can be used as a distance measurement equipment.