The big data technology is leaping forward, asking for higher computing efficiency. Generally speaking, big data has a large volume, comes in various types, can be quickly processed and is of low value density. The explosive growth of big data and the limitation of Moore's Law pose huge challenges to classic computers, whereas quantum computing opens a new horizon for big data development with its unique characteristics. The advantage of applying quantum computing to big data lies in that it breaks the computational limit of the Turing Machine, which not only reduces the complexity of problems, but also improves computing efficiency and computing performance exponentially.