The invention belongs to the technical field of electroplating and relates to an electrotinning additive and a preparation method and a use method thereof. The electrotinning additive is composed of 3-5% of non-ionic surface active agents, 5-10% of beta-naphthol polyoxyethylene ether, 1-3% of alkyl glycoside, 1-3% of thiodiglycol ethide, 1-2% of catechol and the balance deionized water. According to the electrotinning additive and the preparation method and the use method thereof, the electroplating effect of tin electroplating liquid at 20-25 DEG C can be the same as the electroplating effect without the additive at 40-50 DEC C, and therefore the energy consumption of electroplating can be lowered, and the environmental friendliness is higher.