The Qinghai-Tibet Plateau (QTP) is an important snow-covered region highly sensitive to climate change. Snow depth products play a crucial role in monitoring snow dynamics; however, comprehensive evaluations of these products remain limited in the QTP. In this study, six snow depth products were comprehensively evaluated for their ability to capture snow-cover occurrence and detect snow depth in the QTP. Results showed that the High Mountain Asia (HMA) product exhibited the best comprehensive performance. Che's daily snow depth product ranked second only to the HMA product in the comprehensive evaluation. All products showed high performance in the eastern and southern regions, particularly in the humid region. Most products performed better during the warm season (May-September) than in the cold season (October-April). Snow depth trends in the QTP were analyzed based on the evaluation results, showing a decreasing trend during 1980-2023, with maximum and average magnitudes of-0.07 and-0.14 cm (10 a)-1, respectively. Some central and surrounding mountainous areas showed opposite increasing trends. Additionally, the average snow-cover duration (SCD) decrease was-0.32 day (10 a)-1, but SCD showed an opposite increasing trend in temperate arid and semiarid plateau regions. A general trend of later snow-cover onset and earlier snowmelt was observed across most of the QTP, while the temperate arid plateau region showed the opposite pattern. These findings provide a practical basis for selecting snow depth products over the QTP and highlight the heterogeneous response of the plateau snowpack to climate change.