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In order to solve the problem that the flame trigger cannot automatically adjust the gain according to the sky background brightness, which usually result in the situation of signal saturation and no signal output. Based on the principle of multiplication and division, a novel feedforward AGC circuit is designed to expand the dynamic range of the flame trigger. The gain control voltage, which generates by a peak acquisition circuit, a peak over determination circuit, a hold circuit, and a division circuit, is multiplied by the delayed original signal to achieve adaptive amplification of the input signal. It is verified by simulation experiments that the circuit can effectively amplify the analog signal in the range of 80mV~1V to 5V. The dynamic range of the circuit is 15dB~35dB. The delay time is 100μs. The amplitude of the output signal fluctuates less. The maximum error is less than 5%.