The invention discloses a control device, method and system of air treatment equipment. The device comprises an obtaining module, a comparison module, a first determining module and a display module. The obtaining module is used for obtaining parameters of the multiple air treatment equipment of current environments of a user. The comparison module is used for comparing the parameters of the multiple air treatment equipment and a preset parameter in sequence to obtain parameter difference values of all the air treatment equipment. The first determining module is used for determining the air treatment equipment with the largest parameter difference value according to the parameter difference values of all the air treatment equipment and regarding the air treatment equipment with the largest parameter difference value as target air treatment equipment. The obtaining module is further used for obtaining a display image corresponding to the target air treatment equipment. The display module is used for eminently displaying operation information of the target air treatment equipment in a display window by regarding the display image corresponding to the target air treatment equipment as a background image. According to the control device, method and system of the air treatment equipment, convenience of air treatment equipment adjustment for the user and comfort of air treatment equipment utilization for the user can be improved.