The utility model discloses a main transformer maintenance anti-falling net installation bolt frame which is used for being installed on a transformer and comprises a stand column, a steel cable fixedto the transformer and a plurality of horizontal supporting bolt plates connected to the steel cable. Each horizontal supporting bolt plate comprises a long-strip-shaped main bolt plate which is vertically arranged, a supporting end and a connecting end are formed at the two ends of the main bolt plate in the length direction respectively, the connecting end of the main bolt plate abuts against the side face of the transformer, and the supporting end of the main bolt plate extends in the direction away from the transformer; a sleeve is installed on the lower surface of the supporting end, thestand column is arranged in the vertical direction, and the top end of the stand column is sleeved with the sleeve. A first hook hung on the steel cable is formed at the upper part of the connectingend of the main bolt plate; and a first supporting block supported on the outer wall of the transformer is arranged at the lower part of the connecting end of the main bolt plate. According to the utility model, the protection net can be arranged around the transformer, so that potential safety hazards are reduced, the safety of field operation is improved, and safety accidents are reduced.