The invention provides an automatic feed feeding and distributing system as well as a feeding and distributing method thereof. The automatic feed feeding and distributing system comprises a material storage bin, a material discharge duct, a transit bin, material distribution ducts, and a distribution control system; one end of the material discharge duct communicates with the material storage binwhile the other end communicates with the transit bin; a first spiral conveyor shaft is arranged inside the material discharge duct; the transit bin is connected to feeding troughs via a plurality ofmaterial distribution ducts; second spiral conveyor shafts are arranged inside the material distribution ducts; and the distribution control system comprises a first motor, a second motor, a weight sensor, a reflective photoelectric sensor, an ultrasonic distance sensor, and a single-chip. The automatic feed feeding and distributing system is scientific and reasonable in structure design, high indegree of automation, feasible for realizing automatic feed feeding in pig farms, accurate in feeding operation, good in use effects, and capable of saving a large number of manpower cost and improving feeding efficiency in the pig farms.