The invention relates to a preparation method of water-based acrylic epoxy amino baked purple priming paint. The preparation method comprises the following steps: firstly synthesizing a water-based hydroxy acrylic resin WR through the steps of adding monomer and initiator participating the polymerization into a dropwise adding tank, uniformly stirring and mixing, adding solvent in a reaction still, stirring, importing the nitrogen, heating to the reaction temperature, and dropwise adding the mixture of the dropwise adding tank, and completely adding in a certain time, keeping temperature for acertain time, replenishing the initiator, and completely dropwise adding in a certain time, and keeping the temperature for a certain time, cooling, and discharging; putting water-based hydroxyacrylic resin WR into a paint preparing cylinder, adding neutralizer and water, stirring for a certain time at high speed, adjusting a PH value, and respectively adding amino resin, epoxy resin, purple slurry, a defoaming agent, a flatting agent, a wetting agent and a dispersing agent in a certain proportion at high-speed stirring, high-speed stirring for a certain time, and then adding the solvent andthe water, high-speed stirring for a certain time, sampling to detect the fineness and viscosity, and packaging after the fineness and the viscosity are qualified.