The invention relates to a near-infrared response photocatalysis material Cu2(OH)PO4 and a preparation method, the preparation method comprises the following steps: mixing Cu(NO3)2 and Na2HPO4 and adding in deionized water, adjusting the pH value of suspending liquid to 4-7, performing hydrothermal reaction for 6-12 hours at 120 DEG C, separating and purifying, and drying to obtain the product of micro-nano crystal having a quadrature structure, wherein the crystal length is 4-5 micrometers, the width is 1.4-1.6 micrometers, and the surface has ravine. The near-infrared response photocatalysis material Cu2(OH)PO4 has good photocatalysis performance under the near infrared irradiation (Lambda is greater than 800 nanometers), 90% of 2,4dichlorophenol can be degraded in six house, and the performance is excellent.