The invention discloses a preparation process of epoxy mica iron coating. The preparation process comprises the following steps: (1) preparing mica iron oxide powder: adding a mica iron oxide raw material into a ball mill, and grinding the mica iron oxide raw material to obtain mica iron oxide powder; (2) modifying the mica iron oxide powder: regulating the temperature of a high stirrer to 130 DEG C, preheating the high stirrer for 20 minutes, then, adding the mica iron oxide powder into the high stirrer to stir for 10 minutes, raising the temperature of the mica iron oxide powder to 80-100 DEG C, and stopping stirring, adding stearic acid of which the amount accounts for 0.4-1.5% of the weight of the mica iron oxide powder, stirring the stearic acid and reacting the stearic acid for 20 minutes; cooling to obtain the modified mica iron oxide powder; and (3) adding epoxy resin, a diluent, a dispersing agent, a flexibilizer, silicon dioxide, talcum powder, titanium dioxide and a curing agent into a stirrer to stir for 30 minutes with rotation speed of 1000r/min, adding the modified mica iron oxide powder, keeping the rotation speed unchanged and further stirring for 40-50 minutes. According to the preparation process for the epoxy mica iron oxide coating, the mica iron oxide is modified by taking stearic acid as a modifier, so that the dispersing and anti-settling performances are greatly improved; the prepared epoxy mica iron oxide coating is good in stability and long in quality guarantee period.