Beer production technology is mainly composed of wort preparation, beer fermentation, beer filling and other technological processes, and the wort preparation process, that is, brewhouse/mashing. The control of beer mashing process is the most important part in the whole beer production process. The control of the process index plays a decisive role in the stability, taste and other technical indexes of beer. In the beer production control,PLC occupies a very important position, it can form a control system with perfect control function together with the computer, so as to solve the temperature control problem in the mashing process.