Tile saw with retractable water tank

A tile saw with retractable water tank, suitable for detachable installation in a supporting unit, comprising:

• a base unit comprising a frame-shaped seat body adapted to be detachably connected to said supporting unit and a water tank installed in said seat body, said water tank comprising a tank bottom, a surrounding portion extending upward from a periphery of said tank bottom and connected to said seat body, a hard portion connecting said surrounding portion and said seat body and an accommodating space defined by said tank bottom and said surrounding portion and capable of changing a volume of the accommodating space, said surrounding portion being made of a soft material, and a material hardness of said soft material being less than said hard portion, said accommodating space comprising an opening, an opening direction of said opening being defined as a first axis, said seat body surrounding a connecting axis extending along said first axis, said water tank being operable to move relative to said seat body between an enlarged state where said tank bottom is relatively far away from said seat body and said accommodating space has the largest volume and a reduced state where said tank bottom is relatively close to said seat body and said accommodating space has the smallest volume;
• a connecting unit comprising a connecting arm connected to said seat body;
• and
• a saw unit connected to said connecting arm and set above said water tank, said saw unit comprising a saw blade seat and a saw blade pivoted on said saw blade seat.