Child labor is alarmingly prevalent in Egypt .Child agricultural workers are at a greater risk than adult workers. Furthermore, occupational hazards and work conditions may have permanent effects on the growth and development of children.Several public health strategic interventions are required for effective prevention and control of child labor in agriculture. Aim of the study: to assess the knowledge of preparatory school students working in agriculture about work hazards. Material and Methods: this study was conducted in five preparatory governmental schools (including both sexes) at five villages affiliated to Kafer ELzayat city Gharbia Governorate, Egypt as a representative of rural environment. Tool: A structured questionnaire sheet was developed and used by the researcher; it included data regarding socio-demographic data related to the students, past working experience of the child, previous complaints, history of hazards, safety and protective measures and knowledge of students about agriculture work hazards. Results: most of the studied students' source of information was from their parents and family and the majority of studied students had poor total knowledge score regarding the agriculture hazards. Conclusion and recommendations:The present study revealed that, the majority of studied students identified the elements of different agriculture hazards but had lack of knowledge regarding its health effects. It is recommended that the working children should receive full information and training from their employers about occupational hazards related to agricultural work. Such training should be conducted regularly and be understandable by children.