The invention discloses a feeding mechanism, in particular to an automatic feeding machine. The automatic feeding machine comprises a material bin and a hopper, the material bin is in a frame shape and is provided with a plurality of hopper installing positions from top to bottom, the installing positions comprise a plurality of rollers arranged in one horizontal direction, the rollers are connected into the material bin through rotating shafts, a sliding rail matched with the rollers is installed at the edge of the hopper, and a feeding opening is formed in one side of the material bin. The above technical scheme is adopted, the automatic feeding machine is provided with a lifting mechanism for transferring, the hopper can be taken out and transferred to a conveying mechanism outside, a conveying system does not need to be additionally arranged, meanwhile, the lifting mechanism is additionally provided with a mutual interlocking gear in the transferring process, hopper swing can be avoided in the conveying and transferring processes, and the transferring efficiency is improved.