The invention discloses a novel acidic zinc-plating additive. The additive comprises the following components of, in percentage by weight, 25%-35% of fatty alcohol-polyoxyethylene ether sulphonate, 8%-12% of octyl phenol polyoxyethylene ether; 3%-8% of fatty alcohol-polyoxyethylene ether block copolymer, 0.2%-0.8% of benzyl fork acetone, 0.2%-0.8% of o-chlorobenzaldehyde, 2%-7% of high-purity diffusant NNO, 2%-7% of sodium benzoate, 0.8%-1.2% of nicotinic acid, 0.8%-1.2% of cinnamic acid and the balance pure water. According to the additive, a zinc-plated layer with good brightness, leveling and ductility can be rapidly obtained in acid zinc-plating; the cloud point is high, the temperature resistance is good, the current efficiency is high, the light emitting speed is fast, throwing is good, the efficiency is high, and the zinc-plated layer is suitable for rolling plating and hanging plating; the zinc-plated layer is compact in crystallization, non-brittle of zinc and free of foaming,various blue-white and colorful passivation treatment can be easily accepted, and the corrosion-resistant performance is excellent; and the consumption of the additive is less in the plating liquid,supplement and maintenance are convenient, and the additive is economical and practical.