The present invention disclosed a method, device, apparatus and system for mobile control of a part grasping device. The method comprises the following steps: after a signal indicating that a part exists is received, the part grasping device is controlled to move to a preset initial position along a preset track at a first moving speed; the part grasping device is controlled to move towards a target part at a second moving speed, and detection results of three distance detection switches are continuously monitored; when a long-distance detection switch detects that the distance between the part grasping device and the target part is smaller than a first preset distance, the part grasping device is controlled to continue to move towards the target part at a third moving speed; when a short-distance detection switch detects that the distance between the part grasping device and the target part is less than a second preset distance, the part grasping device is controlled to continue to move towards the target part at a fourth moving speed; and when a proximity switch detects that the distance between the part grasping device and the target part is smaller than a third preset distance,the part grasping device is controlled to stop moving and grasp the target part, thus realizing the purpose of accurately grasping parts by a part grasping robot.