A multifunctional external inflating valve having a front portion adapted to be connected to an original tire inflating valve and having an opposing tail end, wherein the multifunctional external inflating valve comprises an inflating valve body provided with a three-way through main body; the main body being provided with an axial middle hole and a middle side surface connecting part, the middle side surface connecting part penetrating a side surface of the main body to connect the axial middle hole; and the side surface connecting part being used for connecting a loading device; a valve core is arranged in the axial middle hole, and the valve core is provided with a valve core body; and a hole cavity is formed in the front portion of the axial middle hole of the main body, and the hole cavity is provided with internal threads adapted to be connected to the original tire inflating valve, characterized in that: an outer conical surface is arranged on the front portion of the valve core, the front portion of the valve core and the outer conical surface protrudes out of a front end of the hole cavity of the main body, a core conical surface sealing rubber pipe is mounted on the outer conical surface of the valve core and used for sealing the valve core and a conical hole sealing surface of the original tire inflating valve inner hole cavity, an axial through hole is formed in the valve core; and a tail end of the main body is processed and formed according to sizes of a hole cavity and internal threads of a standard inflating valve, and a common valve core is mounted thereon. a valve core is arranged in the axial middle hole, and the valve core is provided with a valve core body; and a hole cavity is formed in the front portion of the axial middle hole of the main body, and the hole cavity is provided with internal threads adapted to be connected to the original tire inflating valve, characterized in that: an outer conical surface is arranged on the front portion of the valve core, the front portion of the valve core and the outer conical surface protrudes out of a front end of the hole cavity of the main body, a core conical surface sealing rubber pipe is mounted on the outer conical surface of the valve core and used for sealing the valve core and a conical hole sealing surface of the original tire inflating valve inner hole cavity, an axial through hole is formed in the valve core; and a tail end of the main body is processed and formed according to sizes of a hole cavity and internal threads of a standard inflating valve, and a common valve core is mounted thereon. an outer conical surface is arranged on the front portion of the valve core, the front portion of the valve core and the outer conical surface protrudes out of a front end of the hole cavity of the main body, a core conical surface sealing rubber pipe is mounted on the outer conical surface of the valve core and used for sealing the valve core and a conical hole sealing surface of the original tire inflating valve inner hole cavity, an axial through hole is formed in the valve core; and a tail end of the main body is processed and formed according to sizes of a hole cavity and internal threads of a standard inflating valve, and a common valve core is mounted thereon.