A three-directional laser beam splitting system with high precision pointing adjustment iwas developed， including its hardware and software. This laser beam pointing control of sodium fluorescent Doppler lidar facilitated obtaining quick and accurate signals for long distance observation. Based on the design requirements of the optical system， the physical and mechanical characteristics of the beam splitter and reflector were presented. An angular stroke of 1.18° can be achieved using six high-precision stepper motors combined with six high-precision optical 2-D adjusting frames， with an adjustment precision of 1.1'， and the success rate of repeated positioning is 99.3%. The experimental results meet the precision requirements of the high energy laser emitting system. According to the performance requirements of the system， the laser energy loss is 11.6% after the beam splitter， which meets the laser energy emission requirements of sodium fluorescent Doppler lidar. A set of control software for the system was written to support remote automatic control of the laser lidar.