Blind driving device

A blind driving device, comprising:

• two cord winding and unwinding mechanisms connected to different parts of a blind body of a blind to drive the activity of the blind body, wherein each cord winding and unwinding mechanism comprises bases, reels respectively rotatably mounted to the bases, cords each with one end being wound on a corresponding reel and the other end extending through a corresponding base and extending down to connect the blind body, and a power component for driving the reels to rotate;
• the cords of the two cord winding and unwinding mechanisms are connected to the different parts of the blind body;
• wherein each reel is a conical cylinder whose diameter gradually decreases from one end to the other end, each base forms a first cord guide on a position corresponding to a great diameter end of a corresponding reel;
• one end of a corresponding cord is fixed to a small diameter end of the reel, while the other end of the cord is led out from the great diameter end of the reel after being wound along the reel, and then extends down to be connected to the blind body after extending about the first cord guide;
• wherein the reels of the two cord winding and unwinding mechanisms are arranged in parallel in an axial direction, with the great diameter ends facing opposite to each other, or are arranged in parallel in the axial direction and are misaligned.