Clamping and centering device and method for air hole fine adjustment scion stock

The clamping and centering device comprises a stock frame and a scion frame, two sliding grooves are formed in each of the stock frame and the scion frame, a stock insertion plate and a first insertion plate are inserted into the two sliding grooves of the stock frame respectively, and a scion insertion plate and a second insertion plate are inserted into the two sliding grooves of the scion frame respectively. A plurality of rhombic through holes are formed in the rootstock inserting plate, the scion inserting plate, the first inserting plate and the second inserting plate, the through holes in the rootstock inserting plate, the scion inserting plate, the first inserting plate and the second inserting plate correspond to one another, and a seedling gathering tile is fixedly connected to a sharp corner at one end of each through hole. The method is used for solving the problems that centers cannot be aligned when scions and stocks are grafted and attached and the success rate and the survival rate of whole-di