Knob cap and knob mounting structure

The utility model relates to the technical field of electrical equipment, in particular to a knob cap and a knob mounting structure. The rotary knob comprises a panel with a rotary knob mounting hole, a rotary knob cap is mounted in the rotary knob mounting hole of the panel, a step surface of a positioning ring is positioned behind the panel, and the positioning ring is connected with the panel through a positioning mechanism on the positioning ring and an auxiliary positioning mechanism on the panel. The knob cap comprises a cap body, the cap body end is provided with a flange which is turned outwards, a positioning ring is sleeved outside the cap body, an inner hole of the positioning ring is a stepped hole, and at least one part of the positioning ring is positioned in front of the flange and can be matched with the flange; the outer surface of the positioning ring is in a big-end-back step shape, and the lower portion of the positioning ring is provided with a positioning mechanism along the step face of