The utility model relates to an RH vacuum aluminum hopper weighing sensor mounting structure which comprises a supporting plate, an outer extending connecting rod, a sensor and a fixing support. The supporting plate is arranged on the outer side of the wall of an aluminum hopper in a sleeved mode and is connected with the aluminum hopper through a plurality of reinforcing rib plates. A partially-protruding ear-shaped structure is arranged on the supporting plate and extends into a manhole of an aluminum hopper bin. One end of the outer extending connecting rod is fixedly connected with the supporting plate of the aluminum hopper. The other end of the outer extending plate extends out from the position below the manhole. The fixing support is fixed on the outer wall of the aluminum hopper bin, and the sensor is arranged between the outer extending connecting rod and the fixing support. Compared with the prior art, the RH vacuum aluminum hopper weighing sensor mounting structure has the advantages that (1) the weighing sensor is moved out from the inner portion of the aluminum hopper bin, the working environment is improved, and service life is prolonged; (2) the structure is simple, and mounting is convenient; (3) the outer extending connecting rod and the aluminum hopper bin manhole are sealed through a sealing rubber sleeve, and the inner vacuum environment is not affected; and (4) the structure is mainly used for transforming an existing aluminum hopper weighing system, changing on an original structure is small, and using effect is good.