The invention discloses a method for low-temperature preparing of a silicon carbide nanowire reinforced titanium matrix composite. According to the method, absolute ethyl alcohol, ethyl orthosilicate,distilled water and hydrochloric acid are evenly mixed, graphite powder is added, graphite powder wrapped with silicon dioxide sol is obtained, through the carbon thermal reduction reaction, a silicon carbide nanowire is obtained, the silicon carbide nanowire is subjected to ultrasonic dispersion, titanium powder is added, heat preservation and even stirring are carried out, through drying, silicon carbide nanowire and titanium powder mixed powder is obtained, discharge plasma hot pressed sintering is carried out, and the silicon carbide nanowire reinforced titanium matrix composite is obtained. Discharge plasma hot pressed sintering is carried out at the low temperature and high pressure, the phenomenon that in the high-temperature environment, the silicon carbide nanowire has a reactionwith the titanium to generate carbide and silicide is avoided, strengthening and toughening effects of the silicon carbide nanowire can be ensured, meanwhile, the silicon carbide nanowire and the titanium base are tightly combined, the multi-scale toughened structure is formed, the strengthening and toughening effects of the silicon carbide nanowire can be improved, and the mechanical property ofthe silicon carbide nanowire reinforced titanium matrix composite can be improved.