The invention discloses a pretreatment device, a pretreatment solution and a pretreatment method of acetic acid fiber crimps. Crimp modulus is reduced when tows accept the crimping process to improvefiber elongation, reduce crimp damage and enhance the effect of crimp forming through a pretreatment method of acetate tows corresponding to a fiber crimping process. The pretreatment method includesa spray device, a temperature control system, a micro flow control unit, an atomizing gas circulation device, which can obtain uniform and stable spray before a ribbon entering a crimping machine. Theprovided solution matching spray system can aim at existing problems in the crimping process and add various additives purposefully to achieve the effects that cannot be achieved by traditional steamspray, such as adding lubrication, adjusting external oil content, improving beam performance, preventing vitrification tendency and reducing crimp damage.