The invention discloses outdoor wood-plastic flooring and a manufacturing method thereof. The outdoor wood-plastic flooring comprises a wood-plastic composite layer and a decorative layer, wherein thewood-plastic composite layer is prepared from the following raw materials in parts by weight: 100 parts of rare-earth modified plastics, 40-55 parts of graphene oxide modified polyurethane elastomer,5-15 parts of camellia seed meal, 40-50 parts of poplar wood powder, 10-20 parts of bamboo powder, 5-15 parts of rosin, 20-30 parts of a flame retardant, 5-10 parts of a heat stabilizer, 1-5 parts ofa lubricating agent, 1-5 parts of an anti-aging agent and 1-3 parts of an antioxidant; and the decorative layer is decorative paper with colors or texture. The graphene oxide modified polyurethane elastomer is added into the wood-plastic composite layer, so that the shock resistance and mechanical strength of the flooring are improved; according to the rare-earth modified plastics, the shock resistance and heat-resistant stability of the flooring are further improved; and the compatibility of plant fiber raw materials and polyvinyl chloride plastics is improved by virtue of the rosin, the interpenetrating network structure is generated, the polarity of the plant fibers is weakened, and the water absorption rate of the flooring is reduced.