Novel common rail fuel injector

The invention discloses a novel common rail fuel injector which comprises a needle valve body and a three-way valve body; the three-way valve body is mounted at the upper part of the needle valve body; a needle valve, a spring seat and a needle valve spring are arranged in the needle valve body; a needle valve sealing surface is arranged at the lower part of the needle valve; the needle valve spring compresses the spring seat and the needle valve on the needle valve sealing surface of the needle valve body; a fuel injecting hole and a nozzle fuel inlet are formed in the needle valve body; theneedle valve is matched with the needle valve body to form a volume cavity and a pressure chamber; a three-way valve seat, a three-way valve plate and a reset spring are arranged in the three-way valve body; the reset spring compresses the three-way valve plate on the lower inner end face of the three-way valve seat; and the three-way valve plate communicates with a needle valve control chamber, athree-way valve fuel inle