<p>A manufacturing method of a waste synthetic resin pallet is provided to secure intensity authentically about moment, and to prevent positional deviation of a reinforcing support conveniently. A manufacturing method of a waste synthetic resin pallet comprises the following steps of: injecting a waste synthetic resin mixture(32) into a mold(10); arranging a reinforcing support on the waste synthetic resin mixture; performing a first pressure molding of the injected waste synthetic resin mixture; performing a second pressure molding of the injected waste synthetic resin mixture again; and extracting a molding product from a mold after coagulation of the molding product.</p>
