A　novel　spatial　multi-loop　coupled　mechanism　(SMCM)　with　a　single　translational　mobility　(1T)　is　proposed　in　the　paper.　The　mechanism　is　different　from　traditional　parallel　mechanisms　due　to　three　coupled　chains　connected　with　branches.　Three　parts　are　obtained　through　separating　the　mechanism,　and　mobility　analysis　is　given　from　the　motion　and　constraint　analysis　of　each　part.　Then,　position　solution　is　given　out　to　prove　the　correctness　of　mobility　analysis.　Finally,　trajectory　simulation　is　obtained　by　MATLAB,　which　shows　the　mechanism　can　achieve　the　general　plane　curve　by　one　actuator.　©　Springer　Nature　Switzerland　AG　2019.