The invention provides an integrated type electromagnetic and double-piezoelectric blended fuel injection device which comprises a fuel nozzle and two gas nozzles with the same structure; an electromagnetic valve is utilized to control the fuel nozzle to realize fuel injection; two piezoelectric elements are utilized to control the two gas nozzles to realize gas injection; fuel injection is high in flexibility and can realize multiple injection modes; the fuel nozzle adopts the electromagnetic valve to control motion of a needle valve, and fuel injection mass and fuel injection timing are controllable; the gas nozzles adopt the piezoelectric elements to control motion of the needle valve, the lift of the needle valve is adjustable, and the control precision of gas injection mass and gas injection rate is high; fuel in a needle valve cavity of the fuel nozzle and a needle valve matching part is the same, and the fuel pressure is equal, so that static-state leakage of fuel in the needle valve matching part is avoided; the gas nozzles utilize fuel to seal gas, so that prevention of leakage of gas passing through the needle valve matching part is facilitated, fuel injection pressure and rate are increased, and dynamic property of an engine and fuel economy are improved.