A hook for clothes hanger has a first direction, a main body, a pressing unit and a resilient element. When in use, a hook segment of a clothes hanger is pushed to abut a slope of a blocking segment of the pressing unit, thereby moving the pressing unit along a direction opposite to the first direction. Thus, the hook segment of the clothes hanger can enter the hook. Afterwards, the resilient element pushes back the pressing unit along the first direction, such that the blocking segment is moved back to prevent the clothes hanger from falling off easily. To remove the clothes hanger, the pressing unit is directly pressed. As a result, the hook for clothes hanger does not need any specific operational effort for opening the hook, and only needs a simple press for closing the hook. Therefore, the operation is convenient and quick.