The invention discloses a hair-shearing-and-hair-rounding integrated machine for a circular-head twisted hair brush, and relates to a device for processing the twisted hair brush. The hair-shearing-and-hair-rounding integrated machine comprises a hair brush body, a master controller, a working table, a wire clamping-pulling mechanism, a wire rotating mechanism, a hair shearing mechanism, a hair rounding mechanism, a hair rounding tray and a tray support. The tray support is installed on the working table, a tray autorotation mechanism and a tray deflecting mechanism are installed on the tray support, a hair shearing support is installed on the working table, the hair shearing mechanism is slidingly installed on the hair shearing support, the hair brush body is located between the hair shearing mechanism and the hair rounding tray, and hair materials are in pressed connection on the hair rounding tray; the wire clamping-pulling mechanism, the wire rotating mechanism, the hair shearing mechanism, the tray autorotation mechanism and the tray deflecting mechanism are electrically connected with the master controller. The invention further provides a working method of the hair-shearing-and-hair-rounding integrated machine for the circular-head twisted hair brush. Meanwhile, the invention provides the circular-head twisted hair brush manufactured with the hair-shearing-and-hair-rounding integrated machine for the circular-head twisted hair brush.