The invention discloses a full automatic malleable cast iron pipe fitting flat head machine and a processing method thereof. The full automatic malleable cast iron pipe fitting flat head machine comprises a rack and a PLC (programmable logic controller), a material supporting device, a clamping apparatus device, a feeding device and a power head device, a clamping apparatus supporting plate with a discharge port, a lower clamping apparatus air cylinder, a lower clamping apparatus, a material pressing air cylinder and an upper clamping apparatus connected with the material pressing air cylinder, wherein the material supporting material device, the clamping apparatus device, the feeding device, the power head device and the PLC controller are connected in an electrical control manner, and the clamping apparatus device comprises a supporting plate air cylinder; the lower clamping apparatus is divided into two parts, a part of the lower clamping apparatus is connected with the lower clamping apparatus air cylinder, and the other part of the lower clamping apparatus is arranged on the clamping apparatus supporting plate; the rack is provided with a clamping apparatus device guide rail, and the clamping apparatus device and the clamping apparatus device guide rail are matched and connected in a sliding manner. The full automatic malleable cast iron pipe fitting flat head machine and the processing method provided by the invention have the advantages that the waiting time of a clamping apparatus when a workpiece is unloaded is avoided through a manner of changing the unloading workpiece, the whole processing time of a pipe fitting is reduced, and the processing efficiency of a workpiece is greatly improved.