The present invention relates to the human body scanning technology field, and provides a human body head three dimensional scanner and a three-dimensional modeling method. The human body head three dimensional scanner comprises a frame, a glass plate, a driving device, a support, cameras and lasers, the glass plate, the driving device and the support are arranged on the frame, and the glass plate is located above the driving device. The driving device comprises a servo driving motor, a slide rail, a leas screw and a limiting switch, the slide rail is arranged at the bottom of the frame, the limiting switch and the servo driving motor are arranged on the slide rail, and the servo driving motor is connected with the lead screw. The support comprises a crossbeam and two upright columns, the bottom of the crossbeam sleeves the lead screw via a bearing, and the upright columns are arranged at the two ends of the crossbeam. The three or more than three lasers are arranged on the two upright columns and the crossbeam, and the four or more than four cameras are arranged on the two upright columns and the crossbeam via rotating shafts and are connected with an external computer. The human body head three dimensional scanner and the three-dimensional modeling method of the present invention can measure the form and curve characteristics of a head, and have the advantages of being fast in measurement speed, small in error and little in workload, and being simple to install and accurate to measure.