The magnetic and optical properties of pure, Co/Fe single- and co-doped of SnS2 monolayers are studied by using the first-principles calculation. Results show that all the doping systems are stable. The band structures of Sn15Co1S32 and the configuration I of the Sn14Fe1Co1S32 monolayers show metal behavior. While the band structure of Sn15Fe1S32 monolayer show half-metal behavior. The estimated TC value for the configuration I of the Sn14Fe1Co1S32 monolayer is bout 696.27 K. The absorption spectrums of doping systems have a red shift. The results indicate that Co/Fe doped SnS2 monolayer systems are promising candidate materials for new spintronics and optoelectronic device.