The invention discloses a blowing flow distributing device for double-roller thin-strip continuous casting. The blowing flow distributing device comprises a groove-shaped flow distributor body; air inlets are formed in the two ends of the flow distributor body; channels formed in the air inlets form vertical air inlet channels and a bottom air inlet channel; an air outlet group is formed in the bottom air inlet channel; the flow distributor body is internally provided with a steel liquid containing chamber, and the molten steel containing chamber is provided with a molten steel partition plateso as to form an upper molten steel containing chamber body and a lower molten steel containing chamber body; a molten steel falling hole group is formed in the molten steel partition plate; and a molten steel tapping hole group is formed in the wall surface of the lower molten steel containing chamber body located at the lower part of the molten steel partition plate. According to the blowing flow distributing device, non-uniform flowing of outlet waterflow can be effectively buffered, the tapping amount of tapping holes and the flow rate of molten steel can be effectively decreased, so thatthe high-temperature molten steel can be provide heat for a triangular molten bath from the lower part, the molten steel flowing out of the molten steel tapping holes can be drive to form an upward floating effect and promote upward floating of molten steel inclusions of the molten bath with the coordination of inert gas, the activity degree of the surface of the molten bath can be increased, cold steel membranes can be reduced, and the thin-strip continuous casting stability and the thin-strip quality can be improved.