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Gas-insulated switch cabinets play a significant role in the power industry, and eco-friendly switch cabinets are the hotspot of current development. With the research of alternative gases for SF6, fluorocarbon insulating gases possessing stable physicochemical properties provide a new insight for scientists. This work studies the sensing and adsorption properties of the Pt–MoSe2monolayer for fluorocarbon gas characteristic decomposition products of COF2, CF4, and C2F6in terms of stability, adsorption energy (Ead), charge transfer (QT), band structure (BS), and density of states (DOS) as well as electronic structure based on first principles. The simulation results described Pt as an electron donor in the doping process on the MoSe2monolayer with a binding force (Eb) of −3.739 eV. The Eadvalues of the COF2, CF4, and C2F6gas systems are −0.689, −0.176, and −0.266 eV, respectively. By comparing the BS and DOS of the adsorption system before and after, gas systems become more active, especially the COF2system. Besides, gas molecules all play the role of an electron acceptor in the adsorption process and the QTof the COF2system is up to −0.259e. According to the analysis of this paper, Pt-doping can improve the sensing and adsorption properties of the MoSe2monolayer and the monolayer shows different adsorption phenomena for three gases. The monolayer has a better adsorption effect on COF2, which provides a strong basis for the selective detection of gas sensors.