The invention discloses a method for simplifying signal processing of an MIMO receiver. The method includes steps of 1, a sending terminal of a UE side sends a detection frame, a NB side receives the detection frame and performs channel estimation and obtains a channel estimation matrix; 2, after the NB side obtains the channel estimation matrix, according to a receiving channel-sending channel reciprocity principle, simple conversion can be performed on the channel matrix and pre-coding treatment can be performed at the sending terminal; 3, after pre-coding treatment, the NB sending terminal signals goes to a receiving antenna of the UE through a wireless channel, namely, the signals received by the receiving terminal passes an all-through channel, multiple paths of one signal are converged to one antenna port in the same moment, so that an aim of suppression of multiple paths and signal energy convergence are achieved. According to the invention, through receiving-sending reciprocity and channel pre-coding treatment, multi-path effect is suppressed. The signals received by the receiving antenna are the gathering of original signals in space and time, so that extreme simplification of signal processing of the receiver is realized.