The embodiments of the application provide a light incidence angle measuring system and method. At least one set of micro lens arrays with installation parameters planned in advance, an optical receiving device and a calculating device constitute the light incidence angle measuring system. The calculating device in the measuring system calculates the incidence angle of light to be measured as a measurement result according to the installation parameters of the optical receiving device and spot information formed by the light to be measured on the optical receiving device via the micro lens arrays measured by the optical receiving device, namely, the incidence angle of the light to be measured can be calculated based on the determined information. Thus, the measurement accuracy of the incidence angle of light can be improved.