A handlever of toilet bowl's water tank for controlling a water volumn

A hand lever for controlling the drainage capacity of a toilet bowl is provided to prevent the malfunction in use and to economize in water by controlling the drainage of washing water contained in a water tank using one button. The hand lever for controlling the drainage capacity of a toilet bowl comprises a button(150) operated by a user to control drainage capacity, a body(160) fastened to a water tank and composed of a guide pipe(161) to house the button, a screw thread(163) and a fixing piece(165) with a hinge hole(167), an operating link(170) composed of a hinge pin(171) fitted to the hinge hole of the fixing piece of the body to be rotated freely, a connecting hole(175) connecting the top of a pull strap and a push plate(172) projected to be inclined inward, and a fixing nut(180) coupled to the screw thread formed on the outer circumferential surface of the body and fastened to the water tank.