Disclosed are a button water-stop device and a control method thereof. The button water-stop device comprises a main body (100), a button mechanism (200) connected to the main body (100) in an up and down sliding manner and a swing plate (300) arranged in the main body (100) in a swing way. The main body (100) is internally provided with a front and back perforative water outlet passage (110) and a baffle plate (120) which is arranged in the water outlet passage (110) in a sealing way. The baffle plate (120) is provided with a first front and back perforative water outlet hole (121). The button mechanism (200) comprises a button (210) and an elastic push rod (220) which is fixedly provided below the button (210) and stretched into the water outlet passage (110). The swing plate (300) is provided with a second front and back perforative water outlet hole (310) and a control groove (320) which is composed of two matching grooves (330,340) arranged on left and right sides. The elastic push rod (220) stretches into the control groove (320) and resists against one of the two matching grooves (330,340) optionally to cause the swing plate (300) to swing from side to side such that the second water outlet hole (310) of the swing plate (300) is aligned or staggered with the first water outlet hole (121) to let the water pass through or stop the water. The device of present invention has good sealing performance and can realize precise and convenient control.