The invention discloses a plastic faucet body and a manufacturing die, which belong to the technical field of machinery and aim to provide the plastic faucet body with good sealing performance. The plastic faucet body comprises a left water inlet pipe and a right water inlet pipe, wherein a left valve seat installation groove is formed in the left water inlet pipe, a right valve seat installationgroove is formed in the right water inlet pipe, a connecting cross beam is arranged between the left water inlet pipe and the right water inlet pipe, a water outlet is formed in the connecting cross beam, a middle waterway is formed in the connecting cross beam, the middle waterway communicates with the left water inlet pipe, the middle waterway communicates with the right water inlet pipe, the middle waterway communicates with the water outlet, the middle waterway comprises a left water inlet way and a right water inlet way, and the left water inlet way and the right water inlet way are in curved or U shapes. The plastic faucet body can be used for assembling various cold water and hot water mixed faucets and has the advantage of good sealing performance, and additionally, the plastic faucet body is integrally formed, so that the procedure is simplified, the cost is reduced, and the production efficiency is improved.