In view of the close relationship between the change of liquid level in the tank and the normal operation of beer filling machine, the quality and efficiency of beer production, traditional PID control will be difficult to accurately control the liquid level in the tank. In order to improve the working efficiency of beer filling machine and the quality of beer, precise control of liquid level in the tank is needed. According to the knowledge of fractional calculus theory, a fractional order PID control was proposed. This control extended the traditional PID control to the fractional order domain. The Oustaloup algorithm was used to realize the transformation of the traditional PID control from point to surface to obtain higher control accuracy. To adjust parameters of the fractional order PID controller, a fuzzy fractional order PID controller was proposed by introducing the fuzzy control algorithm in combination with the intelligent control theory, to realize online adjustment of parameters and compare with the traditional control. Simulink toolbox was used to build the simulation platform of the level control system in the tank of beer filling machine controlled by fuzzy fractional PID. Compared with the traditional control, the fuzzy fractional PID controller can obtain good control performance indicators. Both dynamic and static indicators as well as anti-jamming ability were greatly improved. The method presented in this paper can obviously improve the control precision of liquid level in the cylinder, improve the efficiency of beer filling machine and quality of beer, and meet the requirements of industrial production.