The invention discloses a MAS-based purple potato pear compound fruit vinegar fermentation monitoring system and a working method thereof. The system comprises a DSP, a preprocessing Agent, a fermentation process Agent, an alarm unit Agent, a communication Agent and a central monitor Agent. The DSP programs to control the preprocessing Agent, the fermentation process Agent and the alarm unit Agent separately. The central monitor Agent is in interactive control connection with the DSP through the communication Agent. The MAS-based purple potato pear compound fruit vinegar fermentation monitoring system uses a multi-agent control mode. Respective agents operate relatively independently, automatically adjust and solve the sub-problems given by the Agents so that system efficiency is greatly improved. The Agents communicate, coordinate and cooperate with each other, and greatly improve the stability of the system.