The invention discloses a full-spectral response type ammonium tungsten bronze-titanium dioxide composite photocatalyst. The photocatalyst is prepared by comprising the following steps: adding 0.1-1.0g of ammonium tungsten into 20-80mL of ethylene glycol, and performing magnetic stirring at 80-200 DEG C; cooling to room temperature, then adding 0.1-1.0g of raw material titanium dioxide, performing ultrasonic dispersion and stirring to obtain suspension; adding 10-80mL of acetic acid into the suspension and stirring to obtain mixed liquid, transferring the mixed liquid into a hydrothermal kettle, and performing hydrothermal reaction for 10-72h at 160-240 DEG C; and centrifuging and washing precipitate sequentially by using deionized water and ethyl alcohol, and drying to obtain the ammonium tungsten bronze-titanium dioxide composite photocatalyst. The phtocatalyst has photocatalytic activity under ultraviolet light, visible light and even infrared spectra, so that the full-spectrum absorption and utilization of sunshine can be realized; and the photocatalyst has wide application prospects in the fields of environment pollution treatment and purification, environment-friendly functional materials, and the like.