The invention relates to the technical field of porosity acquisition methods and discloses a method for calculating the porosity of each layer of the sinter bed. The method comprises the following steps of: 1, cooling a sintered material; 2, partitioning; 3, taking the sintered material; 4, pouring a solution into a storage vessel, and stopping pouring when the solution begins to overflow from the storage vessel; 5, recording the volume of the solution stored in the storage vessel, and dividing the volume of the solution by the total volume of the storage vessel to obtain the porosity of the sintered material in one region; and 6, calculating the porosities of other regions according to the step 3 to the step 5. According to the method disclosed by the invention, the porosity of each region of the sinter bed can be obtained, which region has higher or lower porosity can be analyzed through comparing the porosities of all the regions, and thus the cloth parameter can be adjusted in a targeted manner; and furthermore, the technical effects of uniform sintering air-permeability and uniform and stable quality of sintering ore can be improved.