该片讲述了大头儿子在小小航天员活动中屡屡受挫，为了鼓励和引导儿子，小头爸爸假扮外星人担任秘密教练。大头儿子逐渐理解了航天精神，关键时刻舍小我为大家，成长为有责任有担当的小小航天员。The film tells the story of Datou the son who continuously suffers setbacks during the Little Astronaut Activity. To encourage and inspire his son, Xiaotou the dad, disguises himself as an alien and becomes Datou’s secret coach. Datou gradually understands aerospace spirit and sacrifices his own interests for the greater good at the critical moment and thus finally becoming a responsible little astronaut.