Method for reconnecting casting blank of continuous casting machine

The invention discloses a method for reconnecting casting blanks of a continuous casting machine. The method comprises the following steps that pouring of an existing tundish is stopped, at least one connecting piece is placed in a crystallizer, the 2/3 part of each connecting piece is bonded with molten steel which is not solidified in the crystallizer, and the 1/3 part of each connecting piece is bonded with the tundish to be poured; waste throwing is carried out 2m before and after the connecting part is connected with the connecting part, rolling is not carried out, and remelting treatment is carried out; before operation of the tundish to be cast, a casting tool is checked and placed on the cover plate; checking the blind block, and confirming the pressure of each medium; after the large ladle is cast, if molten steel does not flow automatically, a thin oxygen pipe is used for drainage, the length of the thin oxygen pipe inserted into the drainage pipe is larger than 15 cm, and drainage is completed; sta