Micro/nanomachines can move automatically and perform complicated tasks. Their wide application is sure to bring about revolutionary changes in many fields, such as biomedicine, micro/nanoengineering, environmental monitoring and remediation, food safety, and social security. To promote the research and development of micro/nanomachines, three symposia have been successfully organized in September 2012 (Dresden), July 2014 (Hannover) and July 2016 (Hannover) respectively. And the 1st international conference on micro-/nanomachines (ICMNM) has been held successfully in Wuhan (China) on August 2017. It is worth celebrating that in 2016, the Nobel Prize in Chemistry was awarded jointly to Jean-Pierre Sauvage, Sir J. Fraser Stoddart and Bernard L. Feringa for their outstanding achievements in the design and synthesis of molecular machines. This event is a milestone and has encouraged a growing number of researchers to be devoted to this promising field, making amazing contributions in designing, illustrating and applying micro/nanomachines. Meanwhile, there are still great challenges to address as well as marvelous prospects to explore. To further promote corresponding exploration and application, the 2nd ICMNM to be held in Harbin on August 25-28, 2019 will provide a perfect venue for global researchers interested in micro/nanomachines to share their research results, establish reciprocal collaborations and spark new ideas.This conference will focus on “Propulsion at Micro/nanoscale”, which includes but limited to micro/nanomotors (active colloids), molecular and DNA machines, micro/nano sensors, micro/nanoactuators, micro/nano robotics. More than 300 researchers from around the world are expected to attend this conference. We are confident that you will enjoy this upcoming conference. Welcome to join us and to visit Harbin, experiencing academic feast and the culture of northeastern of China!