The invention discloses a multilayer thermal press for a sheet material and belongs to the field of sheet material machining. The multilayer thermal press comprises a rack, a press plate oil cylinder, an upper pressing plate, a plurality of carrier plates, a lower pressing plate, side locating rods, a suspending locating rod and a hot gas pipeline, wherein the press plate oil cylinder is connected with the lower pressing plate, and the carrier plates are arranged between the upper pressing plate and the lower pressing plate. The multilayer thermal press further comprises a synchronous closing device, wherein the synchronous closing device comprises two synchronous link mechanisms which are symmetrically distributed at the two sides of the rack, each synchronous link mechanism comprises an upper link, a lower link and a plurality of middle links, one end of each upper link is hinged to the upper pressing plate, a plurality of insertion holes are formed in each upper link, one end of each lower link is hinged to the lower pressing plate, the other end of each upper link is hinged to the other end of the corresponding lower link, one end of each middle link is hinged to the corresponding carrier plate, and the other end of each middle link is inserted into the corresponding insertion hole of the corresponding upper link and is always parallel to the corresponding lower link. The multilayer thermal press is applied to a thermal press procedure of a woodworking board machining process and has the advantages of high degree of automation, high production efficiency and high machined woodworking board quality.