To provide a powder cleaning device capable of collecting and removing accumulated powder with a simple construction without necessity to remove the powder accumulated on a plate while an operator is walking, and to easily and safely remove powder at a low cost.

This falling powder cleaning device 17 collecting and removing powder falling from the return passage 1c under a belt conveyor 1 is provided with a long plate 3 arranged opposite to the return passage 1c along the carrying direction of the belt conveyor 1, a pair of a first drum 5 and a second drum 7 rotatably arranged in parallel with rollers 1d, 1e in the vicinity of both ends in the lengthwise direction of the long plate 3, and a flame resistance belt cloth 9 with both ends fixed to the first drum 5 and the second drum 7, having the length at least about two times the carry length of the belt conveyor 1, the surplus length part being wound on either of the first drum 5 or the second drum 7, and the stretched part between the first drum 5 and the second drum 7 being placed on the long plate 3.