The flame retardant dipping paint used on transformer of rail transport was prepared by using hydroxyl acrylic resin as base material.The effects of curing system,flame retardant,additives and baking technology on the properties of flame retardant dipping paint were studied.The results showed that:when the composite curing agent of low temperature unsealed blocked isocyanate and high imino resin,halogen-free nitrogen phosphorus composite flame retardant,20% addition,acrylic defoamer and silicone leveling agent were used,and the baking process of 60℃×1h+120℃×1h were adopted,the dip coating flame retardant paint had excellent comprehensive performance and flame retardant performance.The flame retardant performance can meet quality requirements for EN 45545-2.