From the first year of 2016 live webcast to the lively answering of the whole network at the end of 2017，the webcast has always been at the cusp. This study assessed the social responsibility of six representative mobile video broadcasting platforms. As a result，it has been found that，overall，the level of social responsibility performance of mobile video broadcast platforms is slightly lower than the median，and the score gap between the platforms is small. Among them，the “coordination relationship” has the best fulfillment of responsibilities，followed by “information production” responsibility fulfillment，and “cultural education” has the worst performance. The study believes that the government should improve and refine the legal normative system，strengthen the division of responsibilities and authority between management departments and communication and collaboration；the live broadcast platform should stick to the correct direction，strengthen the supervision responsibility and optimize the self-discipline system；the live broadcast user should enhance the professional quality of the anchor and the media literacy of user，combine self-discipline and supervision.