Parkinson’s disease (PD) is a common neurodegenerative disorder. In addition to typical motor symptoms, its clinical manifestations also include a range of non-motor symptoms that significantly impact quality of life, such as cognitive impairment, sensory abnormalities, and oropharyngeal dysfunction. Magnetoencephalography (MEG), as a neuroelectrophysiological imaging technique with high temporal and spatial resolution, can non-invasively detect the magnetic fields generated by synchronous neuronal activity in the brain, providing a unique perspective for uncovering neural network dysfunctions underlying non-motor symptoms in PD. This article systematically reviews recent advances in using MEG to study non-motor symptoms in PD. Focusing on core non-motor issues such as cognitive impairment, sensory abnormalities, dysarthria, and dysphagia, it summarizes corresponding MEG characteristics, including abnormalities in oscillatory power within specific frequency bands (e.g., θ, α, β, γ), changes in event-related (de)synchronization, alterations in functional connectivity, and spectral deviations. These neuroelectrophysiological features not only correlate with the severity of clinical symptoms but also suggest the involvement of extensive networks beyond the cholinergic and dopaminergic systems, as well as potential compensatory mechanisms. Current research still faces challenges such as limited sample sizes and high heterogeneity. Future studies should integrate multimodal imaging and longitudinal designs to further clarify the value of MEG biomarkers in the early identification, mechanistic understanding, and treatment evaluation of non-motor symptoms in PD.