The invention discloses a device for measuring the transmittance of curved-surface materials, which comprises a measuring module, a comparison module, a mobile control module, a storage module and a computing module, wherein the measuring module is used for measuring incident signal data, data on signals to be tested, incident light spot area data and data on area of light spots to be tested; the comparison module is used for comparing incident light spot area data with data on area of the light spots to be tested and transmitting the result to a mobile control module; the mobile control module is used for controlling the movement of the measuring module according to the comparison result of the comparison module so that the incident light spot area data are equal to the data on area of the light spots to be tested; the storage module is used for storing the incident signal data and the data on the signals to be tested; and the computing module is used for computing the transmittance of the curved-surface materials according to the incident signal data and the data on the signals to be tested. The device is directly used for measuring the reflectance of the curved-surface materials, and the accuracy of the measured value is high.