The invention discloses a use method of a pier concrete heat preservation maintenance device in a low-temperature season. The problem that an existing winter concrete maintenance effect is not ideal is solved. The heat preservation maintenance device comprises a heat preservation device and a steam supply device. The heat preservation device comprises a heat preservation barrel, wherein the outerside of a pier formwork is sleeved with the heat preservation barrel. The steam supply device comprises a steam generator and a breather pipe, the steam generator is arranged on the outer side of theheat preservation barrel, one end of the breather pipe is connected with the steam generator, the other end of the breather pipe is sealed, the breather pipe is wound round the outer side of the pierformwork, and multiple steam output holes facing the inner wall of the heat preservation barrel are formed in the breather pipe. In the use method, pier concrete is maintained in the low-temperature season through utilization of the heat preservation maintenance device, and it can be guaranteed that the temperature and the humidity of the surface of the pier concrete are relatively even.