The invention relates to a method for achieving unmanned crown block micro-swing control, is used for an unmanned crown block system in the metallurgical industry and belongs to the technical field of automatic metallurgical control. According to the technical scheme, the method comprises the steps that a crown block operation coordinate system is established, and a crown block swing angle coordinate system is established; the relationship among the crown block speed, the accelerated speed, the operation direction and the swing angle direction is found out through decomposition of the crown block operation coordinate system and decomposition of the crown block swing angle coordinate system, acceleration ratio increase and decrease of a large crown block and a small crown block are achieved through projection analysis of the swing angle in different quadrants and swing-angle angle detection, large crown block swing angle control and small crown block swing angle control are completed, and complex crown block swing angle control is converted into simple crown block speed control. By means of the method, the problem of unmanned crown block micro-swing control is effectively solved, the control precision can reach 0.5 degree, and the safe and stable operation of the unmanned crown block system is guaranteed.