The invention discloses a gas composite detector for cable fire, and belongs to the technical field of fire detection. The gas composite detector comprises a microprocessor. The input end of the microprocessor is electrically connected with the output of a power supply and a filtering and amplifying module. The output end of the power supply is electrically connected with the output end of a solargenerating panel. The input end of the filtering and amplifying module is electrically connected with the output end of a signal processing module. The output end of the microprocessor is electrically connected with the input end of an interface circuit and a wireless communication module. The output end of the interface circuit is electrically connected with the input end of a GSM short messagemodule. Comprehensive analysis and processing of various data of the power field can be realized by detection of the temperature and humidity and illumination situation and the gas of the cable fieldso that the accuracy of the processing result can be guaranteed, the information can be immediately sent to the mobile phone of the maintenance personnel through the GSM short message module in case of accident and thus the remedial measures can be taken in time.