The invention relates to the technical field of highway pavement laying, in particular to a cement-stabilized macadam base. The cement-stabilized macadam base is prepared from the following compositions in parts by weight: 78-87 parts of coarse aggregates, 5-13 parts of fine aggregates, 4-9 parts of high belite cement, 0.2-0.8 part of a calcium sulphoaluminate-calcium oxide compound expansion agent and 5-15 parts of water, a waterproof reinforcing agent is sprayed on the surface layer of the cement-stabilized macadam base, and the waterproof reinforcing agent is prepared from the following rawmaterials in percentage by weight: 1-3% of a fatty acid water-proofing agent, 50-70% of a styrene-acrylic emulsion, 15-30% of asbestos powder and 10-25% of water; and the invention further relates toa construction method of the cement-stabilized macadam base. According to the base obtained through construction, compared with the prior art, the mechanical strength is improved, the average temperature shrinkage coefficient and the average dry shrinkage coefficient are both decreased, and the comprehensive performance is improved.