When the current method is used for pulsed laser ranging, the cumulative time error generated by the sine function cannot be eliminated, and there are problems of low reconstruction accuracy and large ranging error. A high-precision pulsed laser ranging research method supported by ARM embedded is proposed. This method introduces the ARM embedded high-speed core processor in the pulsed laser ranging to perform multi-frame correlation detection, adaptive threshold detection, and filter noise reduction. The point averaging method eliminates the accumulated time error in the pulse laser ranging process, and on this basis, the pulse laser ranging accuracy is improved by the difference frequency phase measurement method. Experimental results show that the proposed method has high reconstruction accuracy and small ranging error.