Water tank of sterilizer

The utility model discloses a water tank of a sterilizer. The water tank comprises a tank body, two accommodating chambers which are not communicated with each other and are arranged on the tank body, and a cover plate which is arranged above the accommodating chambers and used for sealing the accommodating chambers, wherein the cover plate is provided with grooves which are recessed towards the accommodating chambers; baffles are arranged on the grooves; a fixing base is arranged at the bottom of each accommodating chamber; the water tank also comprises fastening screws; the fastening screws pass through the bottoms of the grooves and are twisted in the fixing bases so as to fix the cover plate; and the upper ends of the fastening screws form clearances with the baffles. According to the water tank disclosed by the utility model, the cover body can be opened by just loosening the fastening screws which are twisted in the middle position of the cover plate; the fastening screws are limited in the grooves by the baffles and are still on the cover plate when the cover plate is opened, so no loss is caused; besides, the cover plate and the tank body are of a sealed structure, and the structure of the original cover plate and tank body does not need to be changed, so the sealing effect is easily guaranteed.