The invention discloses a novel solder and slag shell separating device. The novel solder and slag shell separating device comprises a box body, a sieve plate, a slag shell outlet door, a solder flowguide plate and a solder outlet door; the box body is provided with a slag shell outlet and a solder outlet; the sieve plate is arranged at the slag shell outlet inside the box body; and the solder flow guide plate is arranged at the solder outlet inside the box body. The novel solder and slag shell separating device disclosed by the invention can be used for separating solder and slag shells remaining after submerged-arc automatic welding in butting of a cylinder body or butting of the cylinder body and a flange of a pipe grinding machine by virtue of the sieve plate. The separated solder iscollected and recycled via the solder flow guide plate and the solder outlet. The novel solder and slag shell separating device can solve the problem about separation of the solder and the slag shelland realizes recycling of the solder.