The 4th International Conference on Big Data and Computing in 2019 will be held in Guangzhou , China on May 10-12, 2019. The topics will focus on big data algorithms, applications and services, big data mining and analysis, big data processing and query. The research field of the Internet of Things and other research areas is aimed at providing experts, scholars and entrepreneurs of relevant research directions with an international cooperation and exchange platform for sharing research results, discussing existing problems and challenges, and exploring cutting-edge technology. Experts, scholars and professional technicians engaged in relevant technical research are welcome to contribute and participate in the conference. Big data is a hot topic nowadays. It can not only form emerging industries, but also promote the development of other industries. It can lead to a big computing society and lead us to a computational intelligent society. As we all know, big data technology is a new generation technology and architecture that extracts value from a variety of ultra-large-scale data at a lower cost and with fast acquisition, processing and analysis techniques. The emergence and development of big data technology has made it easier, cheaper and faster for us to process massive amounts of data. It has become a good assistant to use data and has changed the business model of many industries. This 3-day conference will include invited keynotes and oral presentations. ICBDC 2019 will provide a forum for researchers from both academia and industry to exchange the latest innovations and research advancements in big data, soft computing, cloud computing, networking and computer security. Authors are invited to contribute original research papers which can be submitted electronically via the conference website. The papers accepted after the review and presented in the conference will be submitted for inclusion in Conference Proceedings provided they meet quality standards.