British writer Emily Bronte's Wuthering Heights has always been a classical work for people to research. It is also regarded as a shining pearl on English literature history, a fantastical and romantic work in the world. The protagonists' love-hate relationship reveals the complexity and changeable nature of people. This article analyzes the human nature of different periods in the novel through Heathcliff's madness of love and craziness of revenge but also explore their internal world and the realistic role of their tragic love.