This paper is to discuss the design requirements of emotional fault expression in home robot vacuum in view of the existing fault reporting strategies of home robot vacuum. Through user interviews, the user's emotional design requirements of the home robot vacuum in fault expression are obtained, and the Kano model is used to analyze them, and the corresponding analysis and discussion are carried out according to the relevant results. This paper studies the interaction design requirements of the home robot vacuum in four aspects:framework structure, function service, operation feedback and visual effect, and carries out user satisfaction index and four quadrant analysis. Through the above methods, the user's expectations and requirements for the home robot vacuum in fault expression are obtained. They focus on the reliability and ease of use of the home robot vacuum in fault expression, hope to have appropriate interactive guidance and emotional expression, and have great expectations for the unity of interface vision and the convenience of operation process.