The　emotional　variation　can　reflect　shifts　in　mental　and　emotional　states.　It　plays　an　important　role　in　the　field　of　intelligent　education.　Emotion　recognition　can　be　used　as　cues　for　teachers　to　evaluate　the　learning　state,　analyze　learning　motivation,　interest,　and　efficiency.　Although　research　on　emotion　recognition　has　been　ongoing　for　a　long　time,　there　has　been　a　restricted　emphasis　on　analyzing　the　credibility　of　the　recognized　emotions.　In　this　paper,　the　origin,　development,　and　application　of　emotion　recognition　were　introduced.　Then,　multiple　signals　captured　from　video　that　could　reflect　emotion　changes　were　described　in　detail　and　their　advantages　and　disadvantages　were　discussed.　Moreover,　a　comprehensive　summary　of　the　pertinent　applications　and　research　endeavors　of　emotion　recognition　technology　in　the　field　of　education　was　provided.　Last,　the　trend　of　emotion　recognition　in　the　field　of　education　was　given.