A method for agglomerating tantalum powder comprises the following steps: 1) providing tantalum powder; 2) pre-agglomerating the tantalum powder by using the following mode: adding water into the tantalum powder to completely wet the tantalum powder, separating surplus water out, and pouring part or all of the surplus water out; and 3) agglomerating the tantalum powder by using the following mode for a second time: freezing the pre-agglomerated tantalum powder until tantalum powder particles are agglomerated into blocks, and then taking the blocks out and performing vacuum drying of the blocks, pulverizing and sieving the blocks to obtain agglomerated tantalum powder.