The invention relates to the field of high-voltage switches, particularly to an isolation grounding switch mechanism, a single-pole component and GIS electrical equipment. The isolation grounding switch mechanism includes a housing and an isolation switch and a grounding switch which are assembled on the housing in L-shaped distribution, the isolation switch includes an isolation switch moving contact and an isolation switch static contact, the grounding switch includes a grounding switch moving contact and a grounding switch static contact, a connection contact seat used for being electrically connected with a voltage transformer is arranged between the isolation switch and the grounding switch, the isolation switch static contact and the grounding switch moving contact are integrated on the connection contact seat, the isolation switch moving contact is electrically connected with a main conductive loop, and the grounding switch moving contact is electrically connected with ground potential. The isolation switch and the grounding switch are combined together, overall components and butting faces are few, and the structure is simple and compact.