The embodiment of the invention provides a control method and equipment for friction stir welding and relates to a welding technology. The control method comprises the following steps that when a workpiece to be welded is assembled in place, under the constant amount of indentation, a stirring head is controlled to weld the workpiece to be welded; and after meeting a preset rule, under the constant pressure, the stirring head is controlled to weld the remaining part of the workpiece to be welded. The control device comprises a first control unit and a second control unit which are used for executing the corresponding steps in the control method. Under the constant amount of indentation, the stirring head is controlled to weld the workpiece to be welded, and after meeting a preset condition, the stirring head is controlled to weld the remaining part of the workpiece to be welded, so that the welding defects of back welding spreading, the excessive size of a lifting hook, fins and the like caused by the excessive amount of indentation caused by excessive constant pressure value are effectively overcome, the problem of lack of the effective weld penetration of a welding seam caused by the little amount of indentation caused by small constant pressure value is effectively solved, the weld seam quality is better improved, and the welding efficiency is further improved.