The invention provides a device and method for managing personal water drinking. The device comprises a weighing module, a clock module, an input module, a storage module, a control module, a voice module, a power source module and a display module, wherein the control module is connected with the weighing module, the clock module, the input module, the storage module, the voice module, the power source module and the display module, receives messages of the weighing module, the clock module and the input module, processes the messages and sends the processed messages to the storage module, the voice module and the display module; when the set water drinking reminding time is reached or the set time of the clock module is larger than the set water drinking interval time, the control module sends a message to control the voice module to send a voice prompt message. The device and method for managing personal water drinking have the functions of reminding a person to drink water regularly, counting the daily water drinking amount, reminding the person that the water drinking amount is not sufficient and the like, and therefore personal water drinking can be monitored and managed.