The emergence of the Internet of Things is the inevitable trend of the development of science and technology. There are great differences between Multimedia English based on the Internet of Things and conventional English. Only by deeply analyzing it in combination with the language characteristics of Multimedia English can Multimedia English based on the Internet of Things play its due role. This paper analyzes the language characteristics of Multimedia English under the Internet of Things and finds that from the perspective of vocabulary, the pure professional vocabulary in Multimedia English accounts for 25% of all English vocabulary, and the pure professional vocabulary and semiprofessional vocabulary account for 58% of the total vocabulary. This represents that Multimedia English has an extremely obvious professionalism, so we need to focus on the meaning of professional and semiprofessional words when using English; otherwise, it is easy to affect the actual use effect of Multimedia English with the Internet of Things as the core because of the polysemy of one word.