In order to make up for the shortage of microwave wireless communication in satellite network, satellite laser communication network has attracted much attention because of its advantages such as high data transmission rate, small size, light weight, low power consumption, small antenna size and strong anti-interference ability. This paper summarizes the research progress of satellite laser communication networks at home and abroad, and introduces the key technologies of satellite laser communication networks, satellite network structure, geometry of inter-satellite laser link, satellite network routing algorithm and other important content. Finally, the future development direction of satellite laser communication network is prospected.