The utility model discloses a multifunctional cantilever beam type silencer installing support which comprises a supporting beam with a groove-shape cross section. A fixing plate is welded to one end of the inner side of the supporting beam, and a limiting plate is welded between the supporting beam and the fixing plate. An installing hole is formed in the fixing plate. A cab lifting motor installing hole is formed in the side, close to the fixing plate, of the upper plane of the supporting beam, and silencer installing holes are formed in the side faces and lower plane of the supporting beam. A rib plate, an inner fender support and an outer fender support are sequentially welded in the groove of the supporting beam, and an electric lifting button installing groove and a hydraulic lifting pump installing hole are formed in the outer fender support. The multifunctional cantilever beam type silencer installing support is high in integration and universality and compact in arrangement, the problem of insufficient space is solved, the number and total weight of other supports are also decreased, the requirement for lightweight design is met, later-period maintenance is facilitated, and maintenance and claim expenses of other parts are reduced. The multifunctional cantilever beam type silencer installing support is simple in structure, reasonable in structural design, convenient to manufacture, low in cost and attractive in appearance.