College students are considered as the core force for one nation’s development, so their health conditions influence their nation’s future. In order to make the research into the effect of English competence on food security knowledge of college students and by adopting cluster sampling and making use of a questionnaire on “Food Security Knowledge of College Students”, the paper conducts an investigation into food security knowledge of 681 students of arts and science from 10 universities and analyzes the investigation data by employing such statistical methods as t-test and q-test. The paper ultimately draws a conclusion that English competence of college students has a great impact on how well they can master food security knowledge.