The invention discloses an intelligent gas water heater with an alarming function. The intelligent gas water heater comprises a gas water heater body, a heat exchanger, a water current pipeline, a water flow collection unit, a controller, an alarming unit and a timekeeping unit; the heat exchanger is arranged in the gas water heater body, the current pipeline penetrates through the heat exchanger,the water flow collection unit is arranged at a water inlet of the water current pipeline, and the water flow collection unit, the alarming unit and the timekeeping unit are all connected with the controller. The invention further discloses an alarming control method of the gas water heater. According to the gas water heater and the alarming control method thereof, after water flow collected by the water flow collection unit has no change within a first preset time, and the time kept by the timekeeping unit reaches a second preset time, the controller controls the alarming unit to give an alarm; after alarming information is received, handling can be conducted in time. Through the mode, the safety of showering is improved, and the situation is avoided that when a person takes a shower, the person falls in a faint, or after showering is finished, the person does not turn off a faucet in no time.