The present invention relates to a live pig hanging automatic processing system. The live pig hanging automatic processing system comprises a supporting bottom plate, a cutting plate, a guiding plateand a stablizing device, the cutting plate is arranged on a top part of a right end of the supporting bottom plate, the fixing device is arranged on a top part of the cutting plate, a left end of thecutting plate is connected with a right end of the guiding plate, and a left end of the guiding plate is arranged on a top part of a left end of the supporting bottom plate; and the stablizing devicecomprises a stabilizing bracket, a positioning telescopic body, a positioning spring, positioning push rods, a positioning connecting plate, positioning wheels, an external support mechanism, an extrusion mechanism and a separation guide block. The live pig hanging automatic processing system can solve problems that during live pig half cutting, many people are needed to assist cutting of the livepigs, the live pig half cutting has risks, the live pig half cutting is uneven, the live pig half cutting cuts thoracic cavity of the live pigs and causes waste, the live pig cutting is incomplete, and can achieve functions of positioning conveying and pressing cutting of the live pigs.