This application discloses a method for preparing a powder-rolled brazing plate for low-temperature brazing, comprising: preparing alloypowder; preparing an aluminum alloy shell, and loading the alloypowder into the aluminum alloy shell; performing hot isostatic pressing and hot rolling to obtain the brazing plate; wherein the mass percentage of the alloy powder is: Si 6-12.5%, Cu 1.8-10%, Zn 3.8-20%, Fe 0.1-1.1%, with the balance being aluminum; the thickness of the aluminum alloy shell is 10-20 mm. This method can reduce the brazing temperature of the product, achieving brazing at 530-550℃ with excellent brazing results.