Coastal tourism is tourism types. Coastal Tourism is caused negative effects on the Tonekabon City. The effects and consequences, including: landscape changes, uncontrolled construction, noise pollution, water pollution and environmental damage. But one of the negative aspects of coastal tourism development is security challenges in cities. Objectives of this study coastal tourism development and its impact on various aspects of safety in the Tonekabon city. The research of this study is Survey research method was based on questionnaires. Branch of the statistical community sample of 360 persons sampling is performed. The findings show is coastal Tourism development negative impact on community safety and reduce social security.Coastal tourism is tourism types. Coastal Tourism is caused negative effects on the Tonekabon City. The effects and consequences, including: landscape changes, uncontrolled construction, noise pollution, water pollution and environmental damage. But one of the negative aspects of coastal tourism development is security challenges in cities. Objectives of this study coastal tourism development and its impact on various aspects of safety in the Tonekabon city. The research of this study is Survey research method was based on questionnaires. Branch of the statistical community sample of 360 persons sampling is performed. The findings show is coastal Tourism development negative impact on community safety and reduce social security.