The invention discloses an integrated plastic faucet. A faucet body comprises a plastic shell on the outer layer and a plastic inner core on the inner layer. Injection molding is achieved through double layers of plastic. A valve element installing groove, a cold water inlet, a hot water inlet, a cold water inlet groove, a hot water inlet groove and a water outlet groove are formed when the plastic inner core is subjected to injection molding, and sealing covers are arranged on the cold water inlet groove, the hot water inlet groove and the water outlet groove correspondingly so as to form a cold water inlet cavity, a hot water inlet cavity and a water outlet cavity. The plastic inner core is subjected to secondary injection molding rubber coating, the plastic shell is formed, the faucet body is manufactured without adopting a splicing manner, and accordingly, an overall structure of the plastic inner core is stable and reliable. The manufacturing technology for forming groove bodies different in shape and structure on the plastic inner core in an injection molding manner is easier to achieve, the plastic inner core does not need to be secondarily machined, procedures are reduced, and the production cost is reduced.