In order to explore the interspecific competition of wandering spiders feeding on Ectropis obliqua in tea plantations, the population dynamics of E. obliqua and its natural enemies in Nongkangzao and Pingyangtezao tea plantations in 2021 were investigated. Gray correlation method, Fuzzy graded method and competition coefficient method were used to analyse the competitive effects of different spiders and to identify the most competitive spiders, and then gray correlation and competition coefficient were combined to derive the concept of competition intensity index to verify the accuracy of the results. The results showed a strong correlation between the number of Clubiona japonicola and E. obliqua among the wandering spiders, with the least average competition coefficient for Oxyopes sertatus and the greatest average competition intensity index for C. japonicola in both tea gardens. Spiders with larger populations were not necessarily more competitive. C. japonicola was the most competitive and O. sertatus was the least competitive when feeding on E. obliqua. The Fuzzy graded frequencies are significantly more concentrated in distribution and have higher data validity than the equal graded frequencies, and pre-processing the data with Fuzzy graded method can improve the accuracy of the data when performing interspecific relationship analysis. The results of the study provided a scientific basis for the rational protection and use of wandering spiders to control E. obliqua.