This study, through different administration methods, adopted a randomized, double-blind, placebo-controlled trial design to evaluate the safety and tolerability of human umbilical cord mesenchymal stem cells (hUC-MSCs) in patients with Parkinson's disease, explore their initial effectiveness and the relationship between biological active factors and therapeutic efficacy. The "Clinical Study on the Treatment of Parkinson's Disease with Human Umbilical Cord Mesenchymal Stem Cells" of this study is expected to provide clinical trial evidence for the development of safe and effective clinical cell therapies for patients with Parkinson's disease.