The invention discloses a site industrial spraying device for anti-pollution flashover coating in a transformer substation. The site industrial spraying device comprises a hydraulic balance mechanism, a coating and gas source supply system, a multi-section lifting mechanism and a spraying execution mechanism. The hydraulic balance mechanism comprises supporting mechanisms, hydraulic cylinders and a chassis frame. The four supporting mechanisms are hinged to the four corners of the chassis frame through the hydraulic cylinders respectively. The supporting mechanisms are adjusted so that the whole device can be kept horizontally stable. The coating and gas source supply system comprises a compressed gas storage tank, an anti-pollution flashover coating storage tank, a purified water storage tank and a multi-way electromagnetic valve. The compressed gas storage tank, the anti-pollution flashover coating storage tank, the purified water storage tank and the multi-way electromagnetic valve are communicated through a multipurpose conveying pipe and a multipurpose spray gun. The site industrial spraying device is reasonable in design and simple in structure, the anti-pollution flashover coating can be rapidly and industrially sprayed on a site, and spraying quality and spraying efficiency are improved.