The invention provides a carbon fiber reinforced polymer matrix reinforced board and a preparing method thereof and belongs to the technical field of automobile internal decorating materials. The board is formed in the mode that short-cut carbon fiber is mixed with polymer, and methods of felt making of fiber mixing, lamination of carbon fiber cloth and polymer film and lamination of carbon fiber felt and polymer film are adopted to prepare preforming parts respectively. Then, through a compound forging forming technology, the preforming parts are subjected to pressing forming, and a carbon fiber reinforced composite material of high performance is prepared. The carbon fiber reinforced polymer matrix reinforced board meets requirements of mass and assembly line production, lowers cost, improves production efficiency, and promotes large-scale industrialization application of the carbon fiber composite material.