The invention discloses a cement stabilized macadam base and a construction method thereof, and belongs to the technical field of highway pavement pavements. The cement stabilized macadam base comprises aggregate, cement, water, a polymer mixture, magnetized polyvinyl alcohol fibers and serpentine asbestos powder; and the base is prepared by mixing and constructing the following components, by mass, 4.5% of the cement, 4.5% of the water, 0.3-0.97% of the polymer mixture, 0.6-3% of the magnetized polyvinyl alcohol fibers, 1.5% of the serpentine asbestos powder, and the balance of the aggregate.In the present invention, through mutual cooperation of the designed polymer mixture, the magnetized polyvinyl alcohol fibers, the aggregate and the serpentine asbestos powder, the water resistance is improved, the tensile strength of the cement stabilized macadam base can be effectively enhanced, the influence of temperature, humidity and the reaction effect exerted by a running vehicle due to the friction effect on the base can be weakened to a certain extent, cracking is avoided, the drawing effect of external force can be continuously resisted after cracking within a certain extent range,and the cracking speed of the base is effectively reduced.