Automatic stock bin device and cutterhead replacing system

The utility model belongs to the technical field of machining, and particularly relates to an automatic stock bin device and a cutterhead replacing system. The automatic stock bin device comprises a lifting mechanism, a transplanting mechanism and a stock bin mechanism, and when the lifting mechanism drives the storage bin to move until a first gear in the first layer of the storage bin is meshed with a third gear of the carrying mechanism, a first conveying part of the current layer of the storage bin is in butt joint with a second conveying part of the carrying mechanism; the first conveying piece conveys the to-be-carried piece to the second conveying piece, or the second conveying piece conveys the to-be-carried piece to the first conveying piece. According to the conveying device, the transplanting mechanism can convey the to-be-conveyed pieces to the installation space of each layer of the storage bin at the fixed position, and can also receive the to-be-conveyed pieces conveyed by each layer of the sto