The invention discloses a horizontal moving device of large electrical equipment, and relates to an equipment horizontal moving device in a machine room. Wheels (8) with detachable axles (9) are arranged on the two sides of the lower portions of the two ends of two straight vertical plates (3) respectively. Outwards-folded bent plates (1) are arranged on the portions, close to the upper portions of the two ends, of the outer sides of the two straight vertical plates respectively. The two straight vertical plates are arranged in a spaced mode. Threaded rods at the two ends of two main bearing rods (5) penetrate through holes in opposite faces of the two ends of the two straight vertical plates. The two main bearing rods are locked through a plurality of locking nuts (7) on the outer side faces of the two straight vertical plates. A plurality of corresponding bearing rod adjusting holes (4) are formed in the middles of the two straight vertical plates. At least two auxiliary bearing rods (6) penetrate through bearing rod adjusting holes, corresponding in pairs, of the two straight vertical plates. The large electrical equipment is supported by the main bearing rods and the auxiliary bearing rods, the four outwards-folded bent plates are ejected by a hydraulic device, then the wheels are installed, and therefore the large electrical equipment is horizontally moved.