The invention relates to an automatic feed blending system with an alarm function, and belongs to the technical field of feed processing. The automatic feed blending system comprises an analog signal input module, a controller, an analog signal output module, a display screen and an alarm device. The analog signal input module is connected with a material A weighing sensor, a material B weighing sensor, a material C weighing sensor, a material D weighing sensor, a material E weighing sensor and a material F weighing sensor, and the analog signal output module is connected with a material A feeding valve starting device, a material B feeding valve starting device, a material C feeding valve starting device, a material D feeding valve starting device, a material E feeding valve starting device, a material F feeding valve starting device, a stirring device starter, a disinfection device starter and a discharging valve starter. The automatic feed blending system has the advantages that feed can be automatically blended, mixed, stirred and disinfected, the automatic feed blending system has the alarm function, and accordingly the blending quality and safety can be guaranteed.