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The biogas flare control system is a device for controlling the combustion of biogas in order to prevent it from being released into the atmosphere. It includes an igniter (a device that generates high-voltage electrical pulses to ignite the biogas), continuous monitoring of the flame temperature in the flare, a main flare control valve, and an ignition valve. The specific control approach is as follows: first, divide the gas level in the biogas storage tank into HA and H from high to low, and then close the control valve. When the gas level in the biogas storage tank reaches LL, the igniter generates a spark and at the same time the ignition valve opens to light the auxiliary flare; the success of igniting the auxiliary flare is determined based on the temperature readings. If ignition fails, after a certain period of time the flare system sends another ignition command to the igniter until the auxiliary flare is successfully ignited. When the LA gas level is at a certain value, the flare control system closes the ignition valve, and the auxiliary flare goes out. Regarding the entire wastewater treatment plant control system, the use of a computer-based control system not only meets the control requirements and enables a high degree of automated operation, but also offers significant advantages in terms of investment costs and technological progress. When the gas level in the biogas storage tank is at H, the main flare control valve opens; as the biogas burns down and the gas level in the tank drops to L, there are substantial advantages in terms of cost-effectiveness, stability, and reliability of the main flare system. The I/O count of this control system is of medium to small scale, so the GE Fanuc 90-30 series products are selected. For control systems of medium and small capacity, the 90-30 series offers a high performance-to-price ratio as well as superior safety and reliability; it facilitates system integration, helps users identify solutions to problems, and makes the use of programmable controllers easier.