The purpose of this research is to determine the effect of cooperative writing activities on the writing anxieties of prospective primary school teachers. The study group of the research is composed of 30 prospective primary school teachers. A mixed method consisting of qualitative and quantitative research methods was used in the collection, analysis and interpretation of the data obtained in the research. A total of 12 weeks of cooperative writing activities were conducted within the scope of the research. Writing Anxiety Scale was used to determine the writing anxieties at the beginning and the end of the implementation for prospective primary school teachers. Semi-structured interviews were also held with the candidates to determine the views of the prospective primary school teachers regarding the implementation process. It was revealed at the end of the research that the cooperative writing activities reduced the writing anxieties of the prospective primary school teachers.