In order to realize the efficient recycling of old cement stable base material, the optimum mix ratio of emulsified asphalt cold recycled cement stabilized material by experiments. The effects of different cement content on the mechanics and engineering performance of emulsified asphalt cold recycled cement stabilized material were studied. The optimum cement content was determined by performance tests. Finally, the microscopic morphology of the emulsified asphalt cold recycled cement stabilized material was observed by scanning electron microscope, and the strength formation mechanism was analyzed. The results show that the best cement content in this article is 1.5%, the corresponding best emulsified asphalt content is 4.5%, and the best moisture content is 5.69%. At this time, the splitting strength is 0.6 MPa and the compressive strength is 3.5 8MPa. The compressive resilience modulus is about 1032 MPa, and the splitting strength is 0.51 MPa. After adding cement, the hydration products of the cement combine with the emulsified asphalt to form a network structure to strengthen the bonding strength between the aggregates. The compressive strength, splitting strength, high and low temperature performance of the cold recycled mixture were enhanced further.