Water flow recognition device and oral irrigator

The embodiment of the utility model provides a water flow recognition device and an oral irrigator. The water flow recognition device comprises a shell, a water flow sensor and a controller, the signal receiving and transmitting assembly comprises a signal transmitter and a signal receiver and is oppositely arranged on the shell, at least the signal receiver is connected with a main controller in the machine base, the signal transmitter can send a signal to the signal receiver, when the signal receiver successfully receives the signal, the signal is sent to the main controller, and when the signal receiver receives the signal successfully, the main controller sends the signal to the machine base; enabling the main controller to determine whether water in the water pipe flows or not based on the signal; and the movement assembly is arranged in the shell, is positioned between the signal transmitter and the signal receiver, and is used for moving under the driving of water flow flowing through the shell so as t