The invention relates to winding braking, in particular to a low-voltage line winding braking device for an active power distribution network. The low-voltage line winding braking device for the active power distribution network comprises a supporting base, a brake disc and an air cylinder. The low-voltage line winding braking device for the active power distribution network is characterized in that an abrasion-resisting lamination is arranged on each of the two sides of the brake disc, and a supporting frame is arranged at the rear ends of the abrasion-resisting laminations and connected with an L-shaped connecting rod; two bosses are arranged on the supporting base and provided with shaft holes, and a shaft is arranged on the shaft holes and connected with two connecting rods; and the upper end of one connecting rod is connected to a piston rod of the air cylinder, the middle portion of the other connecting rod is arranged at the lower end of the piston rod, and the two abrasion-resisting laminations oppositely move to tightly hold the brake disc under driving of the piston rod. The low-voltage line device has the beneficial effects that the abrasion-resisting laminations on the two sides oppositely move to tightly hold the brake disc under driving of the piston rod to achieve braking, braking is stable and reliable, the braking device is arranged, so that the braking device is good.