Photovoltaic module backboard testing method

The invention belongs to the field of photovoltaic module testing, and particularly discloses a photovoltaic module backboard testing method which comprises the steps of sample preparation, experimental testing and result processing. Wherein the sample preparation comprises the steps of taking a piece of glass, two EVA adhesive films and a piece of back plate with the same specification, cutting n cuts with the same length on the back plate, marking cross positioning on the EVA surface of the back plate beside each cut, enabling one straight line of the cross positioning to be parallel to the cuts, enabling the other straight line to be perpendicular to the cuts, and laminating and pasting a junction box on each cut; the test comprises the following steps: pretreating in a HAST acceleration test box with the temperature of 120 DEG C and the humidity of 90% RH for 48 hours, then carrying out m times of temperature cycle tests and m times of wet freezing cycle tests, placing the sample in an environment with th