The present invention provides a test apparatus and a test method of the sensitivity of an ultraviolet imager. The test apparatus is used for testing the sensitivity of the ultraviolet imager. The test apparatus comprises an integrating sphere, a variable diaphragm and an attenuation sheet; the integrating ball is provided with a light inlet and a light outlet, wherein the light inlet is used for receiving ultraviolet light emitted by a light source, and the light outlet is used for outputting ultraviolet light with uniform illuminance; the variable diaphragm is arranged on the light inlet of the integrating ball and is used for adjusting the light intensity of the ultraviolet light emitted by the light source; and the attenuation sheet is arranged at the light outlet of the integrating sphere and is used for attenuating the ultraviolet light uniform illuminance to ultraviolet light with preset radiation illuminance. According to the test apparatus and the test method of the sensitivity of the ultraviolet imager of the invention, after the ultraviolet light emitted by the light source passes through the variable diaphragm, the integrating sphere and the attenuation sheet, the ultraviolet light with preset radiation illuminance can be outputted, and the ultraviolet light with preset radiation illuminance is used for detecting the sensitivity of the ultraviolet imager, and therefore, the accuracy of the detection results of the ultraviolet imager can be effectively ensured.