As a rising topic, room-temperature ferromagnetic (FM) semiconductors can gain novel and desired properties in spintronics. Here, we propose an asymmetric hydrogenated zigzag stanene nanoribbons (ZSnNRs), named as H-1-ZSnNRs-H-2, considering the spin-orbit coupling effects. The H-1-ZSnNRs-H-2 is energetic favorably and has the room-temperature FM ground states. Interestingly, benefiting from the modulation of electric field, the band gaps of H-1-ZSnNRs-H-2 monotonously decrease, inducing a phase transition from semiconductor to metal. Moreover, the compressive strain can significantly achieve an indirect-direct band gap transition and the formation of half semiconductor. These results not only open up an opportunity to realize the room-temperature FM semiconductor, but also predicate its tunable electronic properties of the ZSnNRs.