Vacuum grain-wood plastic composite board and manufacturing method thereof

The invention provides a vacuum grain-wood plastic composite board and a manufacturing method thereof. The manufacturing method of the vacuum grain-wood plastic composite board aims to achieve manufacturing of the high-strength sound-absorption thermal-insulating wood plastic composite board and solve the problem that a wood plastic composite material with wood as a raw material cannot achieve excellent thermal-insulating and sound-insulating effects easily. The manufacturing method specifically comprises the steps of material preparation, raw material treatment, plastic processing, primary rolling with rollers, secondary rolling with rollers, adding of a coupling agent, layered laying of board blanks, hot pressing and cold pressing, subsequent processing and the like. The vacuum grain-wood plastic composite board and the manufacturing method thereof have the beneficial effects that a sealed vacuum environment is formed in the wood plastic composite board, so that the wood plastic composite board has part of