The invention discloses a plain bearing bush insulation structure, a bearing bush and a manufacturing technology of the bearing bush. According to the technical scheme of the bearing bush and the manufacturing technology of the bearing bush, the bearing bush insulation structure with a babbitt metal layer poured is included; a V-shaped groove is further included; or, a fiber glass filament layer of 1 mm to 2 mm is arranged.; or, a teflon layer is arranged on the outer surface of the fiber glass filament layer; or, a primary fiber structure is composed of a plurality of secondary fiber structures, and a plurality of stacked filter base layers are included. The defects that a traditional insulation bearing is isolated from a bearing bush through teflon film pasting to cut off a shaft current path, consequently, an insulation film is quite prone to being damaged in the mounting and maintaining process, the repair technology adopted after damage is quite complex, a dedicated tool is needed, and consequently, maintaining difficulty, equipment scraping and the like are caused are overcome. The plain bearing bush insulation structure, the bearing bush and the manufacturing technology of the bearing bush are suitable for insulation plain bearing bushes adopted in various projects, and especially suitable for insulation of plain bearing bushes of matched large rotary machines in the industries such as mines, electric power, coal mines, metallurgy, traffic, chemical engineering, water conservancy, machine tools and chips.