The present study introduced the concept and characteristics of preserved tea plantation, and analyzed application and benefit of stereoscopic trimming and pruning technology in the cultivation of tea tree canopy in preserved tea plantations. The results show that the stereoscopic trimming and pruning technology of tea trees has more advantages in production efficiency than other trimming and pruning techniques in terms of yield and output value, and can better exert the regeneration ability of tea branches. The grade of branching is increased from grade 3-4 before unpruning to 9-13 (3-4 times higher), the length of internode is increased from 1-2 cm to 3-7 cm (increased 3-4 times), the picking area is increased from 0.9 m×1.1 m to 2.8 m×4.2 m (an increase of nearly 10 times), accordingly achieving the best production and economic benefits required in tea production.