The utility model relates to an air -cooled thyristor valve device for static var compensator, the device is organized including two sets of reverse parallel connection's thyristor valve group with to thyristor valve and is carried out refrigerated forced air cooling system, and wherein, two sets of thyristor valve group sets up back -to -back, and separates through the insulation board between two sets of thyristor valve group, the forced air cooling system includes air intake, wind channel, fan housing, fan and ventilation window, air intake intercommunication wind channel, and the wind channel includes a plurality of sub - wind channels, sub - wind channel mutual independence, and thyristor valve group sets up in the inside in sub - wind channel intercommunication fan housing, fan housing intercommunication fan, fan intercommunication ventilation window, set up the deep bead between fan and the fan housing. This device adopts two sets of thyristor valve group to set up back -to -back, has saved the cost, has reduced the volume of valves effectively, the forced air cooling neutron wind channel mutual independence of system, not only heat dispersion is good, and the heat dissipation is even moreover.