The invention provides an engineering realizing method for phase-coded signal sidelobe suppression. The method comprises the following steps: the step 1, executing the sampling processing to original echo data, forming a disperse echo input vector S(n), wherein the length of the S(n) is L, and the sampling length corresponding to the radar transmit signal pulse width is M; the step 2, according to the processing chip capacity, determining the frequency of subsection pulse pressure, wherein the frequency is assumed as P times; the point number of each time of the pulse pressure processing is N, extracting the data of the S(n) from 1 to N to obtain a new data vector X1(n); and the step 3, executing N-point discrete Fourier transform to S(n), to obtain S(w), wherein the length of a sidelobe suppression filter is KXM, and K is multiple, and executing the N-point discrete Fourier transform to obtain H(w), executing the point-to-point multiplication to S(w) and H(w), and executing the N-point discrete Fourier transform to obtain a vector Y1(n).