The present disclosure relates to a fused vector multiplier for computing an inner product between vectors, where vectors to be computed are a multiplier number vector {right arrow over (A)}{AN . . . A2A1A0} and a multiplicand number {right arrow over (B)} {BN . . . B2B1B0}, {right arrow over (A)} and {right arrow over (B)} have the same dimension which is N+1. The multiplier includes: N+1 multiplication sub-units configured to perform multiplication on each dimension of a vector respectively, and take lower n bits of the multiplier number vector for multiplication each time, where the n bits are removed from the binary number of each dimension of the multiplier number vector after the n bits are taken, and n is larger than 1 and less than N+1; an adder tree configured to perform addition on results of N+1 multiplication sub-units obtained from a same operation each time; and a result register configured to hold a result of every addition performed by the adder tree and send the result to the adder tree for next computation.