The invention provides a rectification device capable of removing the plated nickel of filler and conveniently changing the filler and a plated nickel removing method. The rectification device comprises a reboiler, as well as a cooling section, a rectification section and a liquid holding pot which are orderly arranged from top to bottom, wherein a buffering section is arranged between the cooling section and the rectification section; a heater is arranged outside the rectification section; the buffering section is respectively connected with the cooling section and the rectification section through flanges; and the liquid holding pot is respectively connected with the rectification section and the reboiler through flanges. The plated nickel removing method comprises the steps of: heating the filler with the plated nickel, importing carbon monoxide with a certain pressure, and carrying out carbonylation to remove the nickel deposited on the filler so as to restore the usability of the filler. The rectification device of the invention is not only convenient to change the parts of the rectification tower and the filler, but also can remove the plated nickel on the filler to ensure that the filler can be used continuously, thereby guaranteeing the normal production and reducing the cost.