The invention discloses a constant-flow automatic pouring system for iron alloy casting operation, and belongs to the field of metal smelting equipment. The system aims to solve the problem that the casting efficiency is low due to the fact that the existing steel ladle casting continuity and the automatic property are poor. The system comprises a machine frame, a gantry, a pouring device, a ladlecar, a drive mechanism and a hydraulic cylinder, wherein the gantry is fixedly arranged on the machine frame, the pouring device is arranged on the gantry through a rotating shaft in a hinge joint mode, the cylinder end of the hydraulic cylinder is arranged on the machine frame, an output end of the hydraulic cylinder is hinged to the pouring device, under the driving of the hydraulic cylinder, the pouring device rotates around the rotating shaft, two parallel guide rails are arranged on the machine frame, the ladle car is arranged on the guide rails, the ladle car is used for bearing ladles,the driving mechanism is arranged on the machine frame, the driving mechanism is matched and installed with the ladle car, and the driving mechanism drives the ladle car to achieve linear reciprocating motion on the guide rails. The system has the advantages of high mechanization degree and good continuous pouring quality effect, and is suitable for popularization and use.