The invention relates to the technical field of leather making process, and provides a method for making flexible dry milled leather through low-grade wet blue leather. The method comprises the stepsof water squeezing shaving and weighing of the selected low-grade wet blue leather, softening and rising, washing, neutralizing, washing, grease adding, washing, drum outlet standing, water squeezingextension, primary hanging airing drying, softening, dyeing, washing, color registering, washing, surface treatment, washing, drum outlet standing, water squeezing extension, secondary hanging airingdrying, flesh side water spraying and standing, vibration staking, milling and coating. On the basis of the traditional process, three procedures of retanning, filling and vacuum drying in the after-tanning wet machining segment can be removed, the whole operation flow is short, the method is suitable for large-batch production use, the cost is reduced by 30%, the leather yield is increased by 20%, the leather hand feeling is soft and light, the leather body is rich and elastic, the pattern is full and uniform, and the utilization rate is high.