NOVELTY - The system (A) has dehydration-separation unit (1) that spin-dehydrates the vegetable oil waste liquid, and separates oil waste liquid into dewatering cake and supernatent liquor. Boiler (4) generates steam according to combustion of biogas which arose with fermenter. A heater portion (5) is arranged in drying chamber (2) for heating inside of drying chamber by making the steam by combustion of biogas into heat source. Steam supply unit (6) is arranged over boiler and heater portion, for supplying the steam by the boiler to the heater portion.    USE - Processing system of vegetable oil waste liquid such as palm-oil waste liquid produced in manufacturing process of plant-derived oil from palm tree, sugarcane, cassava and coconut tree.    ADVANTAGE - The dewatering cake separated from the palm-oil waste liquid can be dried efficiently, and the briquette can be efficiently manufactured without using electric power and another fuel similarly to processing-system. The organic substance of the waste liquid drained to the lagoon can be reduced significantly. The efficiency of the palm-oil waste-liquid process can be improved, and the productive efficiency of the briquette can be increased. The stable supply of the briquette which becomes goods as a bio-fuel can be performed effectively. Few amounts of methane fermentation of the waste liquid are stored by the lagoon significantly, so that the emitting amount to air of biogas can be reduced. The contamination of the atmospheric contamination and river, or the sea can be suppressed.    DETAILED DESCRIPTION - The steam supply unit is arranged over the fermentation heater portion for heating the inside of boiler and the fermenter, and the steam by said boiler is made to be supplied by the fermentation heater portion. An INDEPENDENT CLAIM is included for processing method of vegetable oil waste liquid, involves heating the fermenter which uses the steam for methane fermentation by making the steam into heat source.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of processing system of vegetable oil waste liquid. (Drawing includes non-English language text)    Dehydration-separation unit (1)    Drying chamber (2)    Boiler (4)    Heater portion (5)    Steam supply unit (6)    Processing system of vegetable oil waste liquid (A)