The utility model discloses a take zone -melting graphite boat of impurity shield groove, including the graphite boat body with offer in this internal zone -melting groove of graphite boat, the cross sectional shape in zone -melting groove be inverted trapezoid structure, internally mounted in the zone -melting groove has a baffle, the baffle is separated into impurity with the zone -melting groove and is kept apart chamber and germanium spindle zone -melting chamber, and has an overflow recess in the processing of the top of baffle, it has the detection line recess to process bottom the germanium spindle zone -melting chamber. The utility model discloses the capacity in zone -melting groove has not only been improved, the effectual productivity that improves zone -melting germanium, and can realize effective separation of impurity and germanium spindle completely, the quantity of effectual reduction tail spindle, the qualification rate of a zone -melting has been improved, the weight of its zone -melting has improved 1~1.5 times, the quantity of tail spindle has reduced by 10 times, the qualification rate of a zone -melting can reach 70~80%, and is simple in structure, easy to operate and implementation, the operation is reliable stable, the production efficiency is improved, the production cost is lowered, visual and easy to popularize and use.