In satellite-ground laser communication link, the laser is easily affected by turbulence effect when transmitting in the atmosphere channel, resulting in signal power fading. Considering the excellent performance and low implementation complexity of Polar Code in short code, it is utilized to satellite-ground laser communication system to combat signal fading induced by atmospheric turbulence. Based on the analysis of turbulence channel, a Polar Code aided simulation platform of satellite-ground laser communication system is established, in which Polar Code is introduced. The results show that under moderate turbulence and strong turbulence, Polar Code reduces the probability of communication interruption by 13% and 25% respectively, which greatly improves the performance of satellite-ground laser communication system.