To provide a waste treatment technology for surely and efficiently treating waste such as waste food generated in restaurants or general households, and sludge generated in paper mills.

Waste N is charged into a treatment tank 1 stored with a waste treating agent A containing wood chips, rice bran, rice chaff, bark of Japanese cedar, branches of camphor tree and Japanese privet, a motor 9 is driven, an agitation screw 12 is rotated continuously for a prescribed time, thereby the waste N in the treatment tank 1 of a waste treatment device 10 is crushed and agitated, then, fermentation by the action of the waste treating agent A, granulation, and moisture vaporization due to temperature rise proceed, and consequently smooth and dry granular treated substance is finally formed in the treatment tank 1.