A constant direction four quadrant lift type vertical shaft wind power generator is provided, which includes a truss-type wind wheel formed by an upper wind disc (5), a lower wind disc (3), and supporting rods (11); a speeder (8); and a generator (9), in which the wind wheel and the speeder (8) are sleeved on a central shaft (2), several groups of vanes (7) are perpendicularly arranged at a diametral top end of the wind wheel by their respective pivots (10), the wind wheel and the vanes (7) are disposed at an upper end of the equipment, and the generator (9), the speeder (8), and a controller are disposed at a bottom of the equipment. The wind power generator can be conveniently installed, operated, and maintained.