Can hotel reservations be superimposed day by day?

Do you mean to stay for one day and book it for one day? Yes, but you should note that this method can be used in the off-season, because the hotel can reserve other rooms for guests, but in the peak season, if there is no room to adjust, you may not stay in the same room or even continue to stay. It's ok to book for several consecutive days directly before check-in, but make an agreement with the hotel in advance and don't transfer you to another room in the future, which will save trouble.