The invention particularly discloses a controller for a gas burner. The controller comprises a power circuit, a control chip, a flame detection circuit, a function driving circuit, a periphery state detection circuit and an indicator lamp circuit, wherein the flame detection circuit, the function driving circuit, the periphery state detection circuit and the indicator lamp circuit are connected with the control chip and the power circuit. The power circuit provides direct current power supply VCC and direct current power supply VDD. Whether flame exists or not can be adjusted by detecting thelevel of the output end of a dual operational amplifier through the diode characteristics of flame, and flame detection reliability is good. Working state of all periphery components are adjusted through the level received by corresponding detection ports of the control chip, interference is small, detection is reliable, automatic ignition can be achieved, the function of detecting flame and the working states of the periphery components is achieved, a gas power can be automatically turned off when abnormal conditions occur, an alarm is automatically given, the cost is low, and safety is high.