The present invention relates to an indoor air sterilization and purification apparatus comprising: a case which constitutes the body and has a partition wall extending downward from the center of the upper surface of the interior thereof; a blower fan including a first fan member, which is coupled to one surface of the upper part of the case with respect to the partition wall and introduces air into the case, and a second fan member, which is coupled to the other surface of the upper part of the case with respect to the partition wall and discharges air to the outside of the case; a sterilization chamber which is disposed inside the case so as to be below the first fan member, and primarily purifies contaminated air, introduced from outside the case, by mixing the contaminated air with first sterilization water; a sterilization device which is disposed inside the case so as to be below the second fan member, and secondarily purifies the air primarily purified in the sterilization chamber; and a filter member that is disposed inside the case so as to be between the second fan member and the sterilization device, and tertiarily purifies the air secondarily purified in the sterilization device.