This book tells the story of Nils, a boy who doesn't like to study and likes to be mischievous. Due to an accident, he turns into a little man, and he and his gander follow a group of wild geese on a long-distance trip across Sweden , During this adventurous trip, Niels went through hardships and endured various tests, tempered his spiritual will and character, increased his knowledge, made many friends, especially animal friends, and aroused a strong patriotism. In the end, Nils returned home, regained his original shape, and became a good boy. This novel, which won the Nobel Prize for Literature, combines animals and people, imagination and reality, with rich plot twists and turns, fresh and poetic language, It is deeply loved by young readers from all over the world, and has been adapted into movies, dramas and other art forms.