To provide a portable spark curing device which is easily treated, is excellent in self-supporting stability and is compactly storable.

The portable spark curing device includes: a frame 16 in which a center frame 12 located at a center and a pair of left and right side frames 14a, 14b located at both the sides of the center frame 12 are turnably connected by hinges 21a, 21b, 22a, 22b; fixing means 18a, 18b capable of non-rotatably fixing the center frame 12 and the respective side frames 14a, 14b at predetermined angles respectively; a self-standing fireproof sheet support frame 10 having hooks 20 (20a-20l) arranged at the frame 16 for detachably retaining a fireproof sheet at the front surface of the frame 16; and the fireproof sheet. The fireproof sheet support frame 10 allows the center frame 12 and the side frames 14a, 14b to be folded in such a way as to be overlapped with each other.