The invention relates to an additive for monocrystalline silicon texturing liquid. The components of the additive include polyvinylpyrrolidone (PVP), diol, benzene-containing organic acid salt, sodium silicate and deionized water. Among them, PVP is a mixture of one or more of PVP‑K12, PVP‑K15, PVP‑K17, PVP‑K25, PVP‑K30, and the weight ratio to water is 0.2‑1.0:100; A mixture of one or more of ethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol and tripropylene glycol, with a weight ratio of 1.0‑3.0:100 to water; containing benzene Organic acid salt is a mixture of one or more of sodium benzoate, potassium benzoate, sodium phenylacetate, sodium terephthalate and sodium isophthalate, with a weight ratio of 0.1‑1.0:100 to water; sodium silicate and water The weight ratio is 0.1‑1.0:100. The formula of the monocrystalline silicon surface texturing agent is: add 25.0-45.0 mL of NaOH solution with a concentration of 30% by weight in 1 L of deionized water, and add 10.0-20.0 mL of this additive.