A working condition automatic interpreting system of satellite power source subsystem comprises a power source data collecting module, a power source uniformization processing module, a power source data processing module, a power source working condition scheduling module, a power source working condition interpreting module, a power source working condition abnormality alarming module, and an imaging displaying module. The invention automatically calls collected and processed corresponding data according to the telemetering data engineering value of the power source subsystem and the data engineering value of the ground test equipment, and the working conditions of power source analysis is judged in real time, reported and displayed according to the criterion, thus reducing work intensity of test staff, solving the problems faults are easy to occur and diverse from person to person in the manual monitoring and judging processes, ensuring uniformity of power source subsystem working condition interpretation and enhancing operational reliability of the satellite power source subsystem.