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In order to solve the problem of system error consistency of each channel of multi-channel humidity measurement and to simplify the ADC circuit, two ADG1607 electronic analog switches and one AD7792 digital-to-analog converter are used to form the signal measurement circuit, and the analog switch array is controlled by MCU to switch, so as to realize the collection of sixteen channels of humidity analog signals, which are sent into AD and converted into digital output according to the preset sequence in time, and the channel switching needs stable time, The empirical value is 10ms. Add appropriate resistance and capacitance to the input circuit to form RC filter circuit to eliminate some burr interference caused by switch switching, and introduce correct discharge circuit to prevent charge accumulation from affecting the measurement accuracy. The circuit is tested. The results show that the maximum error between each channel is 0.17%, the channel consistency evaluation is, the relative error is 0.003, the average absolute deviation is 0.002475, and the standard deviation is 0.095. The circuit has been used in the actual automatic weather station for a long time. The analog electronic switch without mechanical contact can well adapt to frequent switching, and its overall measurement performance index meets the requirements of meteorological observation equipment for humidity measurement accuracy.