Determining the internal stress properties of the reinforcement in the geocell reinforced subgrade is a key factor to control the project cost and effectively play the role of geocell reinforcement. In this paper, the stress-strain relationship of the high-strength geocell is determined through indoor experiments and its constitutive model is determined based on this. Then, based on the ABAQUS finite element software, the calculation models of the geocell and the embankment are established separately by the separation analysis method. Carry out finite element analysis on the embankment reinforced by geocells. By comparing the conditions before and after adding the geocells, the number of reinforced layers of the geocells is changed for analysis, and the influence of the geocells with different paving layers on the settlement and lateral displacement of the embankment is studied. By analyzing the tensile stress properties of the internal reinforcement of the multi-layer geocell reinforced embankment, an improved laying method was proposed and a finite element model was established for verification. The results show that the addition of geocells can effectively limit the settlement and lateral displacement of the embankment, and improve the overall stability of the embankment. Specifically, when a layer of geocell is laid, the vertical displacement at the center line of the subgrade can be reduced by 36.2%. The horizontal displacement at the toe of the slope can be reduced by 74.8%, and the stability of the embankment is positively correlated with the number of layers of the geocell. The internal tensile stress of the geocell reinforcement gradually decreases from the center line of the embankment to both sides of the embankment, and it has tended to zero at the edge of the embankment. When using multi-layer geocells to reinforce, the bottom geocell and the top geocell bear greater tensile stress. On the basis of this rule, the improved geocell paving method is adopted to achieve roughly the same reinforcement effect under the premise of maximum saving of 30% of the reinforcement.