Aiming at the problems of insufficient communication broadband and low contact wear life of traditional slip ring, an off-axis disc type wireless smooth ring based on space laser communication is designed and a prototype is developed. The smooth ring uses optical tracking simulation technology to arrange four infrared emitters uniformly and equally at four corners of the smooth ring, so that the optical power can be received continuously and stably when the receiving end is rotating. The optical simulation and performance test results show that the receiving power of the off-axis disc type wireless smooth ring is -28.3~-29.2 dBm when the transmission distance is 20~200 mm, which meets the requirement of detector sensitivity(about -30 dBm). In the 0~500 r/min rotation environment, the bit error rate will increase with the increase of transmission distance, but the overall bit error rate is less than 10-6.