In civil engineering construction,concrete construction is an important construction process,and at the same time,a floor crack has always been one of the difficulties that have troubled construction personnel.In recent years,with the continuous development of urbanization construction,the number and scale of civil engineering have been increasing,and the quality of concrete floor slabs is directly related to the safety of people's lives and prop-erty.Therefore,relevant personnel should conduct an in-depth analysis of the causes of concrete floor cracks in civil engineering construction,discuss the causes and prevention measures of concrete floor cracks in civil engineer-ing construction,and propose corresponding prevention and control measures.