Laser communication technology with characteristics of large communication capacity, high communication rate, low power consumption, and strong anti-jamming ability, shows great advantage on satellite communication. Meanwhile, the stability and uniformity indexes of the temperature of the laser antenna must be strictly controlled in order to ensure communication duration and quality. This paper proposes an expanded configuration layout and heat radiator + heat pipe type thermal control design scheme, takes a DFH-4E platform satellite laser terminal design scheme as an example, and carries out modeling verification using mechanical analysis and thermal analysis software. The analysis results show that the temperature of the optical mirrors can be limited to 20±4 °C, and the temperature gradient of the telescope tube stabilizes within 2°C/100mm.