Abstract:Objective：To study and analyze the influence of play therapy services on the anxiety of hospitalized children and their main caregivers，summarize the role functions and service experience of medical social workers in carrying out play therapy services in hospitals，and put forward professional thoughts. Methods：Literature research and questionnaire survey were used to compare and analyze the anxiety level of hospitalized children and their main caregivers before and after receiving play therapy services from medical social workers in a certain city children’s hospital. Semi-structured interview was used to investigate and interview subjects’ satisfaction with medical social workers’ services，and the roles and functions of medical social workers in the three stages of service were summarized. Results：There was a significant correlation between receiving play therapy from medical social workers and reducing anxiety in hospitalized children and their main caregivers. Medical social workers mainly play the role of planner and communicator in the early stage of play therapy，guide and therapist in the middle stage，and evaluator and tracker in the late stage. Conclusion：In-hospital play therapy carried out by medical social workers can help improve the medical experience of children and their main caregivers. It is suggested that we should pay attention to the emotional needs of hospitalized children and play multiple roles of medical social workers. Improve the level of hospital game service and form project-based standardized standards.