The utility model discloses a superconductive current limiter of saturable core type and dewar, the dewar includes: inner tube and urceolus, the lateral wall of urceolus has first internal surface and first surface, has first cavity between first internal surface and the first surface, the inner tube sets up in first cavity, first internal surface surrounds and forms the second cavity, and the second cavity is used for placing the direct current post, the lateral wall of inner tube has second internal surface and second surface, on the extending direction of direct current post, have the sub - cavity of first sub - cavity, second and the sub - cavity of third of arranging in proper order between second internal surface and the second outward appearance, wherein, first sub - cavity is used for placing a coolant and first portion, the sub - cavity of second is used for placing the 2nd coolant and second portion, the sub - cavity of third is used for placing a coolant and third part, a coolant is different with the 2nd coolant. The dewar can improve the flowing capability at superconducting coil both ends to improve superconducting coil's flowing capability.