A method for data filtering includes segmenting a to-be-detected vector to obtain k to-be-detected sub-vectors, respectively performing an inner product operation on the k to-be-detected sub-vectors and corresponding detection vectors among preset k detection vectors to obtain k first operation results, determining a first operation result whose value is the maximum among the k first operation results and obtaining an identifier of a detection vector corresponding to the first operation result, where a detection vector is in a one-to-one correspondence to an identifier, and mapping the to-be-detected vector to a preset data filter according to the obtained identifier of the detection vector corresponding to the first operation result whose value is the maximum, and determining, using the data filter, whether to filter out the to-be-detected vector.