The invention provides a closed-loop control method and device, control equipment and a readable storage medium. The closed-loop control method comprises the steps that zone bit information of a target product is acquired, the zone bit information comprises a plurality of zone bit interval values on two assemblies forming the target product, and the zone bit interval values are used for representing the distance between the same zone bits on the two assemblies; calculating deviation rectification data according to the zone bit information; and the deviation rectification data is sent to deviation rectification equipment, so that the deviation rectification equipment performs deviation rectification on two components forming a next product according to the deviation rectification data whensynthesizing the next product. In this way, closed-loop control in the product machining process can be achieved, and the product percent of pass is increased.