The invention discloses a preparation method of black rutile phase titanium dioxide, which comprises the following steps: taking an amorphous titanium oxide precursor, heating to 600 DEG C or above, and calcining for 2-4 hours to obtain white rutile phase titanium dioxide; adding white rutile phase titanium dioxide into a hydrochloric acid aqueous solution, carrying out ultrasonic dispersion, adding metal powder, stirring for 15 minutes or more, centrifuging, taking the precipitate, washing, and drying to obtain black rutile phase titanium dioxide. The process is simple, no toxic and hazary agents is related, production cost is low, the preparation method is simple in process and short in period, the requirement for industrial large-batch production can be met, the obtained black rutile phase titanium dioxide can strongly absorb ultraviolet light, visible light and infrared light in the whole solar spectrum, sunlight can be effectively utilized for a catalytic reaction, and the problemthat an existing rutile phase TiO2 is low in sunlight utilization rate is solved.