Laser communication system is the development direction of high speed real-time communication, which has a high demand for temperature stability and uniformity of the optical components. Under the trend of miniaturization design, the equipment has smaller size and bigger thermal power, which means limited available resources and difficulty of thermal control design to a higher degree. Laser communication terminal in this paper is one of important means of communication between MEO satellite cluster, and its on-orbit maneuvering condition is complicated. Taking into account its maneuvering, thermal design of complete machine for the laser terminal was described. Solar flux of key component in this complicated thermal environment was analyzed, based on which temperature and power in different working conditions are predicted through simulation. The simulation results show that the thermal control methods used here can make all components meet the design requirements, with an average heating power no more than 30 W in a normal working condition.