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Aiming at the new technology of SGCMG cluster agile attitude maneuver, this paper studies a test design method of SGCMG cluster agile maneuver. Based on the analysis of the motion characteristics of SGCMG, the attitude dynamic model of SGCMG cluster satellite and the torque output matrix of SGCMG cluster are established, and the control law and singularity of SGCMG cluster are researched and analyzed. Combined with the attitude dynamics model, kinematics model and PID controller design of SGCMG cluster satellites, a closed-loop simulation system of attitude control for agile satellite is built. The closed-loop simulation is carried out by using the generalized control law without considering singular avoidance. The typical target attitude angles experiencing no singularity, manifest singularity and hidden singularity are searched through traversal search simulation operation. The design and validation of test cases for singular avoidance algorithm of SGCMG cluster agile satellites have been completed, and the comprehensive assessment of the agile maneuverability and system indexes of SGCMG cluster has been realized, which greatly improves the comprehensiveness and effectiveness of test case coverage and has practical engineering significance.