A slightly moisture-proof MR MDF supplier china, its structure includes a board body, a mosaic block, two mosaic blocks, a mosaic groove and two mosaic grooves, the first mosaic block and the two mosaic blocks are arranged on the right surface of the board body, so the The middle part of the top surface of the one mosaic block is provided with a lower expansion groove, and an expansion ball is placed inside the lower expansion groove, and the expansion ball is made of water-absorbing resin material; the first mosaic groove and the second mosaic groove are arranged on the board. The left side surface of the body, and the top surface of the one inlaid groove is provided with an upper expansion groove, and the positions of the upper expansion groove and the lower expansion groove correspond, and the upper expansion groove and the lower expansion groove are both semicircular. Two waterproof layers are set up to improve the waterproof performance of MR MDF supplier china, and expansion grooves and expansion balls are set at the grooves of the fiberboard. When there is liquid seeping down along the connection between the two MR MDF supplier china, the expansion balls are It plays the role of blocking and absorbing water, preventing the liquid from continuing to seep.