The utility model relates to a building floor construction field specifically is a reserved pipe cover of floor poling hole, characterized by: it include a obconic the barrel, locate the handle at this barrel top, still include one be used for with floor lower template connection's connecting plate, this connecting plate central authorities' trompil and both ends and barrel bottom surface fixed connection, whole reserved pipe cover pass through between the template of connecting plate and floor the fastening connection with a pair of bolt and nut. The utility model discloses the be convenient for construction of jointing material for it is full to caulk, is difficult for the seepage, do not have fixtures such as iron nail when installing this pipe box and between the concrete contact surface, do not have the corrosion after the form removal, appearance quality is good, the processing of whole pipe box is convenient, recoverable, and cyclic utilization is energy -concerving and environment -protective.