The invention discloses a smokeless flux formula. The smokeless flux formula comprises a carbon fluorine ion surface active agent, butyl acetate, calcium chloride, polyethylene wax, benzoacetic acid,silicon dioxide and a catalyst; and the flux formula comprises the following components in parts by weight: 100-200 parts of carbon fluorine ion surface active agent, 150-300 parts of butyl acetate, 80-120 parts of calcium chloride, 200-300 parts of polyethylene wax, 320-450 parts of benzoacetic acid, silicon dioxide and 70-90 parts of catalyst. The formula cannot generate a lot of smoke in the welding process, cannot pollute the environment, and is low in irritation.