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In order to reduce loss of people's life and property caused by electrical fire, the effective electrical fire alarm system is urgently needed. A new type of comprehensive fire alarm system is proposed which takes 51 single-chip microcomputer as the core processing chip. The system makes use of temperature sensors and infrared flame sensors to monitor environmental conditions. At the same time, it utilizes a stepper motor to adjust the detection range of sensors to eliminate the system monitoring blind angle. The system can realize the all-round, high sensitivity fire warning. It has strong anti-interference capability, high sensitivity, good real-time performance, low cost and etc. It can meet the fire alarm requirements of fire prone area. Experimental results show that this system can realize the real-time monitoring of various electrical fires. The detection sensitivity and accuracy of the system is high. And it has important significance to prevent fire and fire rescue.