The invention particularly discloses a method for welding a doubly clad optical fiber and a photonic crystal fiber. The method comprises the following steps of: reducing an outer diameter of the doubly clad optical fiber by a fused biconical taper method to ensure that the outer diameter of the doubly clad optical fiber is the same as that of the photonic crystal fiber; heating and collapsing airvent holes around the fiber core of the photonic crystal fiber to ensure that the module field diameter of the photonic crystal fiber is matched with that of the doubly clad optical fiber and keepingthe outer diameter of the photonic crystal fiber basically unchanged; and welding the treated doubly clad optical fiber and the treated photonic crystal fiber by the conventional welding process. Themethod for welding the doubly clad optical fiber and the photonic crystal fiber has the advantages of low cost, high efficiency, high quality and simpleness and convenience.