The invention provides a raw material buffering device for producing glass fiber paper. The raw material buffering device comprises a forming box, a flow limiting plate and a buffering baffle. A supporting plate is arranged above the feeding end of the forming box, an adjusting hand wheel is arranged at one end of an adjusting rod, the other end of the adjusting rod perpendicularly downwards penetrates through the supporting plate to be meshed with the top of the flow limiting plate, the flow limiting plate is installed in the forming box, the two ends of the flow limiting plate are in contact with the two side walls of an inner cavity of the forming box, and a certain distance is reserved between the bottom of the flow limiting plate and the bottom of the inner cavity of the forming box to form a material passing channel. The buffering baffle is arranged on the part, on one side of the output end of the material passing channel, in the forming box, and the bottom of the buffering baffle is hinged in the forming box. According to the scheme, glass fibers are uniform in flow speed, the feeding flow speed is controllable, and the raw material buffering device is convenient to use, practical and excellent in effect.