The invention provides a usage method of an adjustable escalator supporting frame. According to the specific usage method, a step pedal cleaning and drying module is arranged on a pedal of an escalator, and a set distance is reserved between the step pedal cleaning and drying module and the pedal through a hydraulic lifting rod, and a brush assembly in the step pedal cleaning and drying module isexposed of a cover of the step pedal cleaning and drying module and makes contact with the pedal, and the cover cannot move along with the escalator pedal during pedal cleaning; and two telescopic aircylinders on a fixing platform are subjected to telescopic operation, and fixing pieces can make contact with a handrail belt of the escalator. The adjustable escalator supporting frame can be used for adjusting the needed height on the escalator, the two ends of the top of the supporting frame can be used for fixing a speed measuring module of the handrail belt of the escalator or fixing a cleaning module of the handrail belt of the escalator, and operation is convenient for a user.