The invention discloses a dual-sensor dangerous gas comparing and checking system for a robot. The dual-sensor dangerous gas comparing and checking system comprises a main control system, a methane sensor, a carbon monoxide sensor, a communication module and a power supply module, wherein a communication interface in the main control system communicates with the communication module in real time through a communication line; an A/D converter, a single-chip microcomputer, a driving circuit and a comparing and checking module are arranged in the main control system; the A/D converter is used forreceiving a methane signal and a carbon monoxide signal transmitted by the methane sensor and the carbon monoxide sensor respectively to perform analog-digital conversion, and transmitting the methane signal and the carbon monoxide signal to the single-chip microcomputer for acquisition; data transmission is performed between the single-chip microcomputer and the comparing and checking module; and the comparing and checking module communicates with the communication interface. The dangerous gas comparing and checking system disclosed by the invention can compare and check detected data, has high accuracy, and transmits a dangerous signal when a comparison and checking result indicates that the methane or carbon monoxide gas concentration is over high in order to prompt people, thereby avoiding accidents.