With the advantages of high communication rate and strong anti-interference, wireless laser communication is very suitable for space BPV communication, UAV directional communication and other scenarios with large-volume data and high reliability requirements. In order to break the traditional one-to-one laser communication scenario, a multi-user modulating retro-reflector(MRR) laser communication system is proposed in this paper, while ensuring the miniaturization of the receiver equipment and realizing multi-user cascade communication. The closed form solution of the outage probability of the proposed multi-user MRR laser communication system under atmospheric turbulence fading is derived, and the influence of system parameters on the system performance is analyzed. The correctness of the derived results is verified by simulation results.