Using 100 random questionnaires, 89 people said they were increasingly dependent on the Internet for information, while the remaining 11 said they were not dependent much. Nowadays, the development of Internet technology is more and more mature, and the scale of the Internet is more and more large. At the same time, with the gradual deepening of global economic integration, English has become one of the indispensable language methods for international communication and cooperation. The development of network technology has been applied more and more widely in the process of English teaching; especially, the construction, research, and practical application of corpus have ushered in a broad development prospect. Based on web crawler technology, this paper focuses on the construction of web English corpus, which lays a foundation for English learning. Experiments show that crawler technology can effectively solve the collection and recognition of big data in English corpus.