The invention discloses a bind type finger traction device. The device includes a support frame and a servo motor; a first pin is fixed on the support frame, an output shaft of the servo motor fixes the rear ends of a sixth gear and a first connection rod, the first pin is rotatably connected with the rear ends of a first twin-wheel and a second connection rod, and a second pin is rotatably connected with the right end of a fifth connection rod, the front end of the second connection rod and the rear ends of a second twin-wheel and a sixth connection rod; a fifth pin is rotatably connected with the front end of the first pin, the left end of the fifth connection rod and the rear end of a fourth connection rod and fixedly connected with the rear ends of a fifth gear and the fourth connection rod; the sixth gear is meshed with a first gear of the first twin-wheel, the fifth gear is meshed with a second gear of the second twin-wheel, and a first belt pulley of the first twin-wheel and a second belt pulley of the second twin-wheel form a belt transmission; a third pin is rotatably connected with the right end of a seventh connection rod and the right end of a third connection rod, thefront end of a fourth connection rod and a third gear are fixed, a fourth pin is rotatably connected with the left end of the third connection rod, and the rear end of a finger swing rod and a fourthgear are fixed.