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A design of a controller for laser on-line measuring system based on Cortex-M4 is reported, and it aims at solving the problem of too many control modules and complex wiring in the control cabinet of Car Body-in-white laser on-line measuring system, as well as short circuit caused by fracture of flexible visual sensor cables at high strength work. The controller communicates with the host computer via Ethernet, and connects with visual sensors through RS-485 serial bus, controlling them to measure the white body of cars quickly and reliably. At the same time, voltage sampling way of short circuit protection is adopted in the power outputs, and deals with voltage sampling values in combination with the improved amplitude-limiting and limiter average filtering algorithm. Compared with the original control system, the controller has the advantages of simple structure, running stability, low cost and fine real time, ensuring the measurement system operate safely and reliably.