The invention relates to a continuous casting electromagnetic refine and heating device, in particular to a bypass dual-channel electromagnetic refine and heating device for tundish. The device comprises a tundish, a package sprue, a curved channel, and an induction heater around the curved channel, wherein, the curved channel is arranged at both sides of a chamber of the package sprue and connected with a package injection chamber and a tundish casting chamber; the induction heater is arranged around the curved channel with a iron core. The device is externally heated by the tundish to make up the heat loss during casting, thereby realizing the thermostatic casting at low superheat and pinching the molten steel through the channel, which can extract the impurities, oxygen and the like from the molten steel so as to promote the quality of the surface and the interior of the continuous cast. The device has the advantages of long channel, large heating power, high internal-cooling efficiency and small heating device, applicable to the technical reconstruction of the tundish in particular to the prior tundish, and can wholly mount and dismount and conveniently maintain.