The invention provides a bathtub drainage device and a remote control method of the bathtub drainage device. The bathtub drainage device comprises a drainage mechanism, a drainer and a mobile terminal, wherein the drainage mechanism is respectively provided with a drainage hand wheel, a drainage mounting plate, a separating component and a cam component, the separating component is provided with a drainage rotating shaft, a first gear, a second gear and a spring, the cam component is provided with a fourth gear and a cam rotating shaft, the drainer is connected with a pull rod, and the cam rotating shaft is flexibly connected with the pull rod through a transmission sheet. The bathtub drainage device is characterized in that the drainage mechanism is provided with a direct current motor with a third gear, the drainage hand wheel can work by a manual operation or a direct current motor being powered on to drive the gears so as to drive the pull rod to control the on/off of the drainer. The bathtub drainage device realizes convenient effects of mechanical type manual drainage and energized remote control automatic drainage and can select different working manners as required. The bathtub drainage device is simple and reasonable in structure, and can be operated locally or remotely, thereby greatly bringing convenience to users.