The invention provides an early strength type polycarboxylate superplasticizer as well as a preparation method and application thereof. The superplasticizer provided by the invention is prepared by copolymerizing multiple monomers with different structures of an unsaturated polyether monomer and the like, can effectively improve the early strength of cement and a product thereof as well as concrete, meanwhile, can also avoid the technical problem that the compatibility between components in an existing mixed preparation is poor, decreases the confection difficulty of the superplasticizer and improves the use flexibility of a product; meanwhile, in the method provided by the invention, a high-temperature reaction is not needed; the production energy consumption can be obviously decreased; the energy conservation and emission reduction are facilitated.