Based on the panel smooth transition regression (PSTR) model, this paper empirically analyzes the relationship between Chinese local government’s bond financing and economic growth, with the quarterly panel data of bonds issued by local governments and their investment and financing platform companies in the open market from 2008 to 2018 as samples. The research shows that there is a gradual non-linear relationship between local government bond market financing and economic growth in China. With the increase of the scale of local government bond market financing in China, the effect of bond market financing on economic growth will gradually decline and have a negative effect. This result means that for developing countries like China, it is not advisable to rely solely on government investment to drive economic growth.