A solar-blind ultraviolet irradiation calibrating device relates to the field of ultraviolet irradiation calibration and solves the problems that existing solar-blind ultraviolet detection is narrow in dynamic range and low in accurate. The device comprises an L-shaped light track, an ultraviolet light source, an inlet diaphragm, a shielding cover, an integrating sphere, an outlet diaphragm, a silicon detector, a reference detector and a horizontal electric displacement bench, wherein the inlet diaphragm is used for controlling the radiation energy flux entering the integrating sphere, the shielding cover is used for shielding environmental stray light around the light source from entering the integrating sphere, the outlet diaphragm is tightly attached to an outlet of the integrating sphere and used for controlling the radiation energy flux of the outlet of the integrating sphere, the silicon detector is used for monitoring the irradiation change situation on the wall of the integrating sphere, the reference detector is used for measuring the irradiation at some position, and the horizontal electric displacement bench enables the reference detector and a detector to be detected to be arranged at the center of a light path in turns. The solar-blind ultraviolet irradiation calibrating device is simple in structure, strong in operability, high in accuracy and capable of achieving solar-blind ultraviolet detector irradiation calibration in a large dynamic range of 10-7 to 10-13W/cm<2>.