The invention discloses a multifunctional environment-friendly landscaping retaining wall. The retaining wall mainly includes a planting structure, two support structures, a landscaping structure, a connection structure, a reinforcing structure and a drainage structure; the planting structure is positioned at the upper portions of the support structures; the landscaping structure is positioned onthe front sides of the planting structure and support structures; the connection structure is positioned between the two support structures, the reinforcing structure is positioned at the lower portions of the support structures, and the drainage structure is positioned at the lower portions of the support structures and landscaping structure. The multifunctional retaining wall which integrates ecological protection, landscaping, drainage, reinforcement and the like is constructed, and meanwhile, planting grooves with an excellent water and fertilizer preservation effect, a preparation methodof a planting medium with enough water and fertilizer, an ecological and environment-friendly landscaping wall body, a firm and stable supporting wall body, ingenious and firm connecting components and a design method of a convenient and effective drainage structure are provided. The retaining wall for protecting a slope can achieve various practical functions and have multiple benefits in ecology, economy, society, aesthetics and other aspects.