The invention provides an operation tool for machine room top working, and belongs to the field of power construction. The operation tool comprises a stabilizing rod and a work rod, and fasteners are arranged on the stabilizing rod and the work rod; each fastener comprises an end fastener body and an on-rod fastener body; the distance between the end fastener body and the on-rod fastener body of the stabilizing rod is equal to that between the end fastener body and the on-rod fastener body of the work rod; and the stabilizing rod and the work rod are placed in parallel, the stabilizing rod is connected with an adjusting rod through the corresponding end fastener body, and the end of the adjusting rod is connected with the on-rod fastener body of the work rod. The work rod is connected with a fixing rod through the corresponding end fastener body, the fixing rod is connected with the stabilizing rod through the on-rod fastener body of the stabilizing rod, and a work device is arranged at the end, away from the end fastener body, of the work rod. The operation tool is simple in structure and high in universality, the manpower cost and time cost of work can be effectively reduced, the safety of top construction work in a machine room can be improved, and the limitation that due to the fact that the space of the machine room is small, work is inconvenient to carry out is also avoided.