Testing method of reflectivity of back board and EVA assembly in photovoltaic module

The invention discloses a testing method of reflectivity, which comprises the steps that a back board, back surface EVA (ethylene vinyl acetate), an isolating membrane, battery pieces, front surface EVA and glass are stacked in sequence, and laminated by laminating equipment, and a photovoltaic module with the isolating membrane is obtained; the photovoltaic module with the isolating membrane is stripped and separated from the isolating membrane, and a back board and back surface EVA assembly is obtained; and the reflectivity of the back board and back surface EVA assembly is tested. According to the testing method of the reflectivity of the back board and EVA assembly in the photovoltaic module, the isolating membrane is additionally arranged among back surface EVA and the battery pieces and then conventional laminating is performed, so that the back board and back surface EVA assembly required to be tested can be separated; then a reflectivity test is performed; in this way, the real reflectivity of the bac