The invention provides a single-voxel localized 1-D high-resolution homonuclear decoupling spectrum method, and relates to a magnetic resonance apparatus. On the basis of a traditional 2D localized correlated spectroscopy, the method adds linear adiabatic sweep (chirp) pulses and gradients applied at the same time to form a z-filter module that can effectively suppress a zero-quantum coherent pathand other paths so as to obtain a pure Lorentz absorption linetype nuclear magnetic resonance spectrum. The selection of voxels is accomplished together by selective pulses combined with selection layers and destruction gradients. The post-processing of the experimentally acquired data can yield a 1-D spectrum with only chemical shift information. The 1-D localized spectrum obtained by the invention can eliminate the phase distortion caused by the zero quantum coherence, thereby having the advantages of high spectral resolution and the like. This method can be used for the study of the biological tissue and living body localized spectrum to obtain more concise and perfect spectral information, so that the localized spectrum has a wider range of applications.