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The monitoring of the density of combustible gas is usually needed in daily production and life. The old detector based on semiconductor sensor has disadvantages, such as low response speed, low measurement accuracy. Propose a detector based on catalytic combustion sensor and MCU. The detector uses C8051F120 as the core MCU, and Wheatstone bridge to amplify the output signal of the sensor. The signal of Wheatstone bridge is then processed by the ADC module of C8051F120, besides this, C8051F120 controls the relay and achives the alarm output. At last, the density of the combustible gas is transferred to the upper monitor by the UART part of the MCU and the digital communiction circiut based on MAX485 with MODBUS protocol. In the conditions of 20℃,standard atmospheric, aerate the detector with methane in the concentration of 20LEL,50LEL,80LEL respectively, the measurement result of the detector is 21LEL,50LEL,77LEL. The experimental results show that the dector has high precision,fast response,good stability and very high practical value.