The invention discloses a method for purifying daptomuycin. According to the method, half-purified daptomuycin is loaded on a gel type weak anion resin for combination at first and is eluted the next. The purification method provided in the invention enables obtained daptomuycin to have purity higher than 98%; the raw materials used in the method are easily available and cheap; therefore, it is easy to popularize and apply the method.