Flushing water control device for a toilet tank

A flushing water control device for a toilet tank to discharge different amounts of flushing water from a toilet tank, comprising:

• a casing having a through-hole defined therein and a pair of channels formed on both sides thereof;
• a shaft having a front end and a rear end, said shaft being rotatably arranged in said casing with said front end extending out through said through-hole, said shaft being spring-loaded to define an initial rotation position and to force itself to return to said initial position after being rotated;
• a disk secured to said shaft between said ends and having a pair of posts spaced apart at a predetermined angular distance;
• a reel mounted around said shaft near said rear end and having a peripheral recess for receiving a string, said string having an end fixedly attached to said reel;
• a pair of trigger members pivotally connected to said casing, each trigger member being pivotal to a first position in which one of said posts is retained by said trigger member after said shaft is rotated away from said initial position through a respective angle, and to a second position in which said post is released to return to said initial position;
• a pair of poles movable through said channels in said casing and having respective floats attached to lower ends thereof;
• and
• wherein said poles are connected to said trigger members so that each of said trigger members is maintained in said first position when water in said toilet tank is at full level but pivots away from said first position to said second position when said float thereof goes down with ebbing water level within said toilet tank.