The invention discloses a blow-in device and method for a blast furnace. The blow-in device comprises a wind baffle, a support frame and ignition pipes, wherein a first channel for coke at an edge part to decline is formed between the wind baffle and the outer edge of a blast furnace cylinder, and a round hole in the wind baffle is a second channel for coke in the middle to decline; the support frame is used for supporting the wind baffle and is a frame body which is formed through welding a pipe body and has a gap; and the ignition pipes are uniformly distributed at the furnace bottom of theblast furnace and are located at the lower end of the support frame. The ignition pipe is located at the bottom end of the support frame and is protected from being crushed and collapsed by upper furnace materials in a charging process by virtue of the support frame, and the support frame is the frame body with the gap, so that heat can be guided to the furnace body in the ignition process, and coke can be adequately combusted; meanwhile, by virtue of a sufficient space between the wind baffle and the support frame, the air permeability and liquid permeability of the coke at the lower part ofthe furnace cylinder are guaranteed; and besides, after the support frame is fused by the coke, a space is formed so as to promote the decline of the furnace materials. According to the device, iron residue can be smoothly discharged during the blow-in of the blast furnace.