The invention relates to a lift force and resistance combined vertical axis wind power generation system, which comprises a wind wheel, blades, a wind collecting structure, a wind wheel traveling system, a transmission system, a power generator and electromotors; the wind wheel comprises lift force and resistance combined spiral blades; the transmission system comprises a central gear and a plurality of planetary gears, wherein the central gear is meshed with the planetary gears, and the transmission system is connected with a mainshaft of the wind wheel; and the planetary gears drive the electromotors, and the electromotors drive the transmission system. The lift force and resistance combined vertical axis wind power generation system can effectively overcome the defects of poor self-starting performance, system vibration and the like of the traditional vertical axis wind power generator, increase the safety when a fan is large in size, realize an all-weather wind collecting function of the system, improve the wind power utilization coefficient by more than 10% and greatly reduce the operation cost of the system. The power generation efficiency of a vertical axis fan can be improved in multiply by strengthening the windage at the positive stress side of a vertical axis wind wheel, strengthening the aerodynamic performance of the blades and arranging a plurality of electromotors on one fan.