The invention discloses a brake wind power speed-increase gearbox and a wind driven generator. The brake wind power speed-increase gearbox, a rotary driving assembly and a tower are included; and thebrake wind power speed-increase gearbox is arranged in a cabin, the rotary driving assembly comprises a positioning assembly and an edge assembly, the edge assembly is connected with the positioning assembly and is distributed to the edge of the positioning assembly, and the cabin is connected with the top of the tower through a yaw assembly. Through unified transmission of a first speed change assembly and a second speed change assembly, the transmission ratio of the input end to the output end is changed, the rotating speed of the generator is increased, and the overall mechanism can supplysufficient electric energy. Meanwhile, as a rotating blade can be detached and assembled conveniently, different states of the rotating blade can be changed under different scenarios such as use, carrying and transporting according to actual needs, and flexibility is better achieved.