The invention relates to titanium nitride powder based on a low temperature liquid polymerization process and a preparation method of the titanium nitride powder. According to the technical scheme, the method comprises the following steps: mixing metal magnesium powder, alkali metal inorganic salts and titanium dioxide powder according to a molar ratio of 1:(1.5-2.0):(0.25-0.50); or mixing metal magnesium powder, alkali metal inorganic salts and sodium titanate powder according to a molar ratio of 1:(1.5-2.0):(0.06-0.08); respectively maintaining the temperature of respectively mixed powder for 2-6 hours in a nitrogen atmosphere and under the condition of 900-1300 DEG C, and naturally cooling; adding the fired product into a hydrochloric acid solution for soaking for 5-6 hours, washing 3-5 times by using distilled water, and drying for 8-12 hours under the condition of 90-110 DEG C, so as to obtain the titanium nitride powder based on the low temperature liquid polymerization process. The titanium nitride powder disclosed by the invention has the characteristics of rich raw materials, low production cost and simplicity in industrial production. The titanium nitride powder prepared by the method is high in purity and excellent in morphology characteristics.