Design test method and device for photovoltaic module in seawater environment

The invention provides a design test method and device for a photovoltaic module in a seawater environment. The test method comprises the steps of enabling a test piece to be subjected to appearance and electrical performance testing, recording initial data, and then fixedly placing the test piece in a test box; discharging a hot seawater solution into the test box till that the test piece is submerged; repeatedly pressurizing and decompressing the test box for multiple times; discharging the hot seawater solution out of the test box, and discharging a cold seawater solution into the test box till that the test piece is submerged; repeatedly pressurizing and decompressing the test box for multiple times, and then discharging the cold seawater solution out of the test box; repeating the cycle for multiple times, taking out the test piece, performing appearance and electrical performance testing on the test piece, and recording test data; and comparing the initial data with the test data to obtain the appearanc