The invention provides a fuel injector mounting seat for a vehicle and relates to a fuel injector for the vehicle. The fuel injector mounting seat is used for a port injection type engine. The head ofthe fuel injector, a valve ball and a valve seat are retained in a cavity formed in the mounting seat. The cavity is externally connected with a gas injection device. The gas injection device is usedfor blowing and injecting gas to the head of the gas injection device, and/or the valve ball and/or the valve seat so as to prevent foreign matter from being generated or/and retained in the fuel injector in the operating process of the fuel injector. The head of the fuel injector is used for injecting burning fuel of the vehicle. The engine is an engine with a supercharger or/and with supercharging and exhaust recirculation functions. In the operating process of the engine, the burning fuel of the vehicle is injected by the head of the fuel injector. Gas injected to the head of the fuel injector or/and the valve ball or/and the valve seat by a gas injection device can cool the head of the fuel injector, the valve ball and the valve seat so as to prevent generation of foreign matter; andthe retained foreign matter can be blown away the surrounding portion of an orifice plate and fuel injection holes of the fuel injector.