In order to solve the problem that traditional vital sign measurement is limited in use scenarios and realize non-contact vital sign measurement, this paper proposes a method to measure human vital signs by using laser frequency modulated continuous wave ranging system. In this paper, the life signal measured by the laser frequency modulated continuous wave ranging system is smoothed and filtered to remove the random movement signal of the body, and then the processed signal is decomposed by ensemble empirical mode to separate the heartbeat signal and respiratory signal. The vital signs of healthy adults were measured under normal static conditions and breath-holding conditions. The experimental results show that the respiratory rate measured by the algorithm provided in this paper is 17-20 times /min and the heart rate is 75-90 times /min. The experimental results are consistent with biological laws and reflect the feasibility of the algorithm, which is expected to provide reference value for some special scenes, such as neonatal vital signs monitoring and non-contact vital signs measurement of severe burn patients.