The invention relates to a quartz composite board. The method for manufacturing the quartz composite board comprises the following steps: uniformly mixing quartz stone, unsaturated polyester resin, pigment, curing agent, accelerant and coupling agent in a mixer, putting in a mold, pressing in a vacuum-pressure forming machine, heating to cure, fixing thickness from the front side and the back side, polishing and cutting. The quartz composite board has high density and strength and enhances the quality of the quartz composite board.