Manufacturing method of multilayer board

The invention belongs to the technical field of wood processing and handling, and concretely discloses a manufacturing method of a multilayer board. The manufacturing method of the multilayer board comprises the following steps of (1) cutting and drying; (2) laminating and repairing dried single-layer boards; (3) preparing a glue: adding 4.5 to 6 parts of ammonium chloride into 58 to 63 parts of phenolic resin adhesive, uniformly mixing, and then adding 30 to 35 parts of flour for mixing; (4) coating the glue: utilizing a glue coater for coating the glue on the single-layer boards, and adhering the single-layer boards into a multilayer plywood; (5) laminating: cold pressing the adhered multilayer plywood, wherein the cold pressing pressure is 10 to 12mpa, and the time is 1.5 to 2h; and standing for 0.3 to 0.5min after cold pressing, and then hot pressing, wherein the hot pressing pressure is 13 to 15mpa, the temperature is 108 to 113 DEG C, and the time is 0.2 to 0.25; and (6) after standing and maintaining f