The invention discloses a sliding plate for marine product sliding and a sliding plate type sliding method, which comprise a body which is a hollow cuboid enclosed by baffles, the body is internally provided with a plurality f box-pile beams, a first eye plate, a second eye plate and a third eye plate are sequentially arranged on the left side of the body from front to rear, the third eye plate, the first eye plate and the second eye plate are sequentially arranged on the right side of the body from front to rear, a plurality of lugs are arranged on the front side and the back side of the body, a plurality of groups of high polymer material baffle groups are arranged on the lower surface of the body, the center of the interior of each group of square baffles is transversally provided witha clapboard, the hollow position of each group of baffles is respectively the high polymer material baffle, and the high polymer material baffles are fixed on the lower surface of the body through bolts. The invention also discloses a sliding plate type sliding method which utilizes the sliding plate to enable vessels to slide. The invention has small size, repeatable use, low cost, small risk, convenient fraction, relatively reduced operation cost and high safety factor.