The invention provides a method for processing a drill by adopting supercritical composite plating based on a movable anode. The method for processing the drill by adopting the supercritical composite plating based on the movable anode comprises the following main steps: preprocessing a base material of the drill, so that the drill has capability of electrically depositing a nano composite coating; adding prepared electroplating solution into a reactor, sealing, introducing CO2 gas, and adding a surface active agent, so that an electroplating system under the supercritical condition is formed; setting parameters, such as current, temperature and mechanical stirring speed which meet electrodeposition requirements; adjusting relative position between an anode and a cathode, setting the travelling speed and stroke of the anode, and switching on, so that the nano composite coating can be well deposited on the surface of a processed drill taken as a cathode main body; taking down the drill after electrodeposition is finished, and cleaning, so that the drill with a high-performance nano composite coating on the surface is obtained. The drill manufactured by adopting the method provided by the invention is fine in surface texture, abrasion resistance and hardness are greatly improved, and service life is prolonged.