The invention relates to the fields of thermal control and automation, and discloses a control method and device of water robbing prevention in operation of a feed water pump system and the feed waterpump system. The control method comprises the following steps that feedwater flow needing to be provided by multiple automatic feed water pumps is separately obtained through a flow distribution loop; rotating speeds needing to be provided by the multiple automatic feed water pumps are separately obtained through a main loop according to the obtained feedwater flow needing to be provided by the multiple automatic feed water pumps; and the multiple automatic feed water pumps are separately controlled to feed water through a subsidiary loop according to the obtained rotating speeds needing to be provided by the multiple automatic feed water pumps. The problem of water robbing during simultaneous operating of the multiple automatic feed water pumps is solved, and stable control over the feedwater flow is realized.