The development of technology has made live broadcasting an important way of social interaction with people in contemporary society. The campus activities of colleges and universities are also upgraded and innovated through live broadcast technology. Various campus activities such as small and medium-sized conferences, small evening parties, teaching competitions, and course production also have innovated production methods in the new media era. Given the COVID-19 pandemic and the need for online conferencing, live broadcasting of electronic field production has become frequent and normal in colleges and universities in recent years. It is necessary for colleges and universities to introduce a portable live broadcasting system for electronic field production for small and medium campus events. We present a small system that helps college video producers to complete electronic field production more portable and efficient. Four elements of the system are (1) The directing switcher. (2) The shooting equipment. (3) Wireless HD video transmission. (4) Wireless communication. Such a system is also helpful in large-scale activities as a second-level directing part, which plays a complementary role in a complex broadcasting system.