Brake linkage device of small vehicle

The invention provides a brake linkage device of a small vehicle. The brake linkage device is provided with a shell. A linkage piece and a driven piece are arranged in the shell. A first sliding chute, a second sliding chute and a fixing through hole are formed in the linkage piece, a first fixing piece is arranged in the first sliding chute ad connected with a front braking pull wire, the front braking pull wire penetrates through one end of the shell, a second fixing piece is arranged in the fixing through hole and connected with a front-wheel braking pull wire, and the front-wheel braking pull wire penetrates through the other end of the shell. Another first fixing piece, another second fixing piece and a third fixing piece are arranged on the driven piece, the first fixing piece is connected with a rear braking pull wire, the rear braking pull wire penetrates through one end of the shell, the second fixing piece is connected with a rear-wheel braking pull wire, the rear-wheel braking pull wire penetrates