In order to meet the need of testing cable quality parameters during the production process and make the cable parameters reach the allowable error of the national standard, a design scheme of a laser cable measurement system is proposed. The laser cable measurement system consists of the laser measurement system and data processing system. With ARM as the core controller, the laser and linear CCD sensor are used for online detection and data processing of the cable outer diameter, and the cable outer diameter can be accurately measured without contact. The laser cable measurement system can be directly applied to the cable production line to measure the cable in real time. Under the working conditions of the production line, the system has a simple structure, high precision and good application prospect.