The invention provides an ecological restoration method of a slope. The ecological restoration method of the slope comprises the steps of smoothing the slope surface, paving geotechnical cloth on the smoothed slope surface and fixing the geotechnical cloth by use of an anchor rod, paving a honeycomb restraint system on the geotechnical cloth and fixing the honeycomb restraint system by use of an anchor rod, filling a plant growth substrate, paving a lawn nursery strip on the honeycomb restraint system, and nursing plants after paving is completed, wherein the honeycomb restraint system is composed of cells and reinforced belts passing through the cells; the lawn nursery strip comprises a geonet, setting paper, grass seeds, a slow release fertilizer and the setting paper, all of which are orderly paved from top to bottom; the ecological restoration method of the slope has the advantages that as the honeycomb restraint system is paved on the slope, the service life of the work can be greatly increased, the maintenance cost is reduced and the construction period is shortened, and the honeycomb restraint system is good in water permeability and moisture retention property, and capable of protecting soil from erosion by rainwater, and conserving and retaining soil; the method is short in construction period, convenient for maintenance, low in cost, capable of reinforcing the slope while restoring the ecology of the slope, and suitable for the soft foundation slopes of various gradients.