On behalf of the IACT, we would like to welcome you to the 2019 2nd International Conference on Big Data and Machine Learning in Chengdu, China during November 8-10, 2019. It is mainly organised by International Academy of Computing Technology (IACT) and technically supported by some universities and associations. This unique international conference provides a forum for academics, researchers and practitioners from many industries to exchange ideas and share recent developments in the field of Big Data and Machine Learning. Here we have an opportunity to collaborate and advance the theory and practice of major trends in related fields. We will also have an excellent opportunity to network with the leading scholars and practitioners.