The invention discloses a method for preparing a phosphorus accumulating filler by sintering a mineralized refuse material and belongs to the field of preparation of water treatment materials. The method comprises the following steps: selecting mineralized refuse with the domestic refuse landfilling time of more than 10 years and dewatered sewage obtained by using an Al salt coagulant, and sieving raw materials with a sieve; proportioning the mineralized refuse and the dewatered sewage obtained by using the Al salt coagulant, wherein the weight percentages of the aged refuse and the dewatered sewage obtained by using the Al salt coagulant are 60-80% and 20-40% respectively; using the proportioned raw materials to prepare 5-50mm of filler, airing naturally, sintering at 600-1400 DEG C, and carrying out heat preservation for 5-60min to obtain the phosphorus accumulating filler. In the method, the characteristic that the contents of Ca, Al and Fe are high is utilized, the adsorption capacity of the filler to P in sewage is increased, and the maximum adsorption capacity of the filler is 6-8 times that of an artificial wetland filler, namely zeolite. The resource utilization that solid wastes are used for preparing the filler can be realized, the service life of the artificial wetland can be prolonged and mineral resources can be saved.