In the complex environment,the efficiency of single UAV is relatively low,so UAVs tend to be more and more clustered and collaborative.For laser powered UAV cluster,efficient charging scheduling is very important to improve the survivability of UAV cluster.This paper presents an Real-time Energy Detection Online Charging Strategy(REDOCS).The real-time energy consumption rate of UAV is calculated according to the remaining energy of UAV at each time,and then the remaining flight time of each UAV is calculated to select the UAV to be charged.Compared with the off-line charging strategy,REDOCS can improve the efficiency of the whole network and reduce the UAV cluster forced landing rate.Finally,an example shows that REDOCS performs better in the charging scheduling of UAV cluster.