Quality detection system of a hard pulse light photon therapeutic apparatus therapeutic light head, belonging to the selectivity spectrum hard-light medical measurement test technical field, comprising an light source system, a monochromator system, a condensation system, a therapeutic light head, a photoelectric receiving part and a computer. The therapeutic light head is fixed on a detection platform and the computer controls the bidirectional movement of the detection platform by a step motor and the light source from the light source system passes through the monochromator system, the condensation system to the therapeutic light head and then the computer judges whether the photoelectric receiving part receives the light signal or not and the spectrum distribution condition of the therapeutic light head is displayed based on the judgment result. The detection system obtains the spectrum distribution curve diagram of each point and furthermore obtains the spectrum distribution soled curve diagram of the whole work surface and the device quality consistency is fundamentally ensured and the technical base of the physical layer is provided direct towards best clinical effect of different individuals.