Soil moisture in the Qinghai-Tibetan Plateau (QTP) plays an important role in regional and global climate change via its impacts on water cycle and ecosystems. Due to the lack of long-term and large-scale field observations of soil moisture in this area, remote sensing products potentially provide useful data sets for the Earth system models. Among them, the Climate Change Initiative (CCI) soil moisture products issued by the European Space Agency (ESA) have been widely used. Here we used in-situ soil moisture data from three networks to evaluate the applicability of CCI products (active, passive, active-passive combined) on the QTP. The three networks represent semi-humid (Maqu), semi-arid (Naqu), and arid (Shiquanhe) climate conditions. The results showed that all the three CCI products could capture temporal and spatial distribution of soil moisture content in the growing season on the QTP. The correlation coefficient between active-passive combined product and in situ measured values was the highest among the three networks. In the semi-arid areas dominated by alpine meadows, the CCI active-passive combined product showed a correlation coefficient above 0.8 and RMSE below 0.06, but the CCI combined product underestimated soil moisture in the area with dense vegetation (Maqu) and overestimated it in the barren ground (Shiquanhe). From the spatial distribution, the active product overestimated soil moisture, and the passive product showed great fluctuation in soil moisture, with the maximum value of 0.98 m³/m³. The active-passive combined product (0-0.65 m³/m³) was similar to the actual spatial distribution of soil moisture. The results provide a reference for the application of CCI products in retrieving soil moisture content in the QTP.