A vertical wind power generator, comprising a tower column, at least one generator unit and at least two blades; wherein: the central axis of the said tower column is perpendicular to the horizontal plane; wherein the said blade includes at least one blade unit; the cross section of the said blade unit is olive-shaped with big middle and two small ends, and one end of the two small ends is arc-shaped and the other end is a tip; the said blade unit includes a skeleton and a blade body, the blade body is installed on the skeleton, one end of the blade body is provided with a first blade tip and the other end of the blade body is provided with a second blade tip on the radial direction of the blade unit, the tail of the first blade tip is the arc shape of the said blade unit, the tail of the second blade tip is the tip of the said blade unit; characterized in that: the said generator unit includes a bracket, a generator and an exciter; the bracket includes an outer bracket and an inner bracket; the said generator includes a stator and a rotor, the stator is fixedly ringed on the tower column, the rotor is provided outside of the stator and is fixedly provided on the inner bracket, a generator stator winding is provided on the said stator, and a generator rotor winding is provided on the rotor; the said exciter includes an exciter stator and a exciter rotor, the exciter stator is fixedly ringed on the tower column, the exciter rotor is provided outside of the exciter stator and is fixedly provided on the inner bracket, an exciter stator winding is provided on the said exciter stator, and a exciter rotor winding is provided on the exciter rotor; an excitation control device and a rotation rectifying device are provided inside the said bracket, the generator stator winding links with the exciter stator winding through the excitation control device, and the generator rotor winding links with the exciter rotor winding through the rotation rectifying device; the said generator stator winding is linked with a bidirectional frequency converter; the other end of the bidirectional frequency converter is linked with a power grid, and linked with the excitation control device; the lower end of the said bracket is provided with a first flange with different cross sections on the upper end and lower end, the lower end of the first flange is provided with a first bearing, the outer ring of the first bearing connects with the small end of the first flange, the inner ring of the first bearing is fixedly ringed on the tower column, and the big end of the first flange connects with the lower end of the bracket; the upper end of the said bracket is provided with a second flange with different cross sections on the upper end and lower end, the upper end of the second flange is provided with a second bearing, the outer ring of the second bearing connects with the small end of the second flange, the inner ring of the second bearing is fixedly ringed on the tower column, and the big end of the second flange connects with the upper end of the bracket; a third bearing is provided above the said second bearing and the inner ring of the third bearing is fixedly ringed on the tower column; the head of the first blade tip stretches into the blade body, and the head of the second blade tip stretches into the blade body; a first moving device, which drives the first blade tip to move along the radial direction of the blade unit, is provided between the said skeleton and the first blade tip, and, a second moving device, which drives the second blade tip to move along the radial direction of the blade unit, is provided between the said skeleton and the second blade tip; a first guide rail group is provided between the said first blade tip and the blade body, a second guide rail group is provided between the said second blade tip and the blade body, and the said blade unit after connected is arc-shaped; the upper end of the said blade connects with the outer ring of the third bearing, and the lower end of the blade connects with the outer ring of the second bearing; a cooling system is provided on the said generator unit, the said cooling system includes a fan blade, a cooler, a seal plate and a fan; a bracket duct is provided between the said outer bracket and the inner bracket; a duct is provided on the said generator stator, generator rotor, exciter stator and exciter rotor; an air outlet is provided on the lower end of the inner bracket, and an air inlet is provided on the upper end of the inner bracket; the bracket duct connects with the air outlet and the air inlet; the said fan blade is provided obliquely on the outer wall of the outer bracket; the said seal plate is provided on the tower column, and is located in the upper end of the inner bracket; the fan is provided on the seal plate, and the cooler is provided above the fan; a crane is provided on the top of the said tower column; the said tower column is a hollow tower column, and a lift system is provided in the tower column.