The invention discloses a quality testing method of a solar photovoltaic cable. The quality testing method comprises the following testing steps of: 1, placing the solar photovoltaic cable in a place with the environment conditions that the temperature is 90 DEG C and the humidity is 85%, carrying out air thermal aging test for 1000h, and after the test is finished, when the maximal change rate of the strength/elongation of the solar photovoltaic cable does not exceed +/-30%, judging the solar photovoltaic cable to be qualified in the test and carrying out a next testing step; and 2, placing the solar photovoltaic cable in a low-temperature refrigerating cabinet at -40+/-2 DEG C, carrying out a low-temperature test for 16 hours, and after the test is finished, when the solar photovoltaic cable has no cracks, judging the solar photovoltaic cable is qualified in the test and carrying a next testing step. The method disclosed by the invention is reasonable, the actual service environment of the solar photovoltaic cable is used during testing, so that the actual quality condition of the solar photovoltaic cable can be tested effectively, the actual service life of the solar photovoltaic cable can be measured, the quality problems are reduced, and the method has extensive popularization and application values.