High-speed shaft brake of wind turbine generator set

The invention discloses a high-speed shaft brake of wind turbine generator set, which solves the problems of the existing device, such as small braking moment, short service life and long braking reaction time. The high-speed shaft brake comprises a caliper chassis (1), a passive caliper (2) and an active caliper (3), wherein the caliper chassis (1) consists of a spectacle-shaped base and two parallel guide posts (4); a passive brake pad (6) is arranged on a chair of the passive caliper (2); guide pipes (5) are respectively fixed on the left and right ends on the back side of the chair of the passive caliper (2); an oil cylinder (20) is arranged in the head part of the T-shaped active caliper (3); a piston (21) in the oil cylinder (20) extends downwards and is connected with an active brake pad (8); and a brake disk (19) of the high-speed shaft of the wind turbine generator set is arranged between the active brake pad (8) of the active caliper and the passive brake pad (6) of the passive caliper (2). The high