The invention provides a water leakage locking alarm device of an accurate air conditioner. The device comprises a water sensor, wherein a first port of the sensor is connected with a positive electrode and a negative electrode of a direct-current power source, the first end point of the first port is connected with the positive electrode of the direct-current power source, and the second end point is connected with a negative electrode of the direct-current power source; a second port of the water sensor is connected with a water leakage probe; a third port of the water sensor is a normally-open contact, the first end point of the third port is connected with the negative electrode of the direct-current power source, the second end point of the third port is connected to an alarm lamp and a loudspeaker which are connected in parallel, and the other end of a parallel-connection circuit is connected with the positive electrode of the direct-current power source; and a fourth port of the water sensor is a normally-closed contact, the first end point of the fourth port is connected with the negative electrode of the direct-current power source, the second end point of the fourth port is connected with the first end point of a control port of electromagnetic valve, and the second end point of the control port is connected with the positive electrode of the direct-current power source. According to the water leakage locking alarm device of the accurate air conditioner, when water leakage happens to the accurate air conditioner, a water inlet pipe is closed; and audible and visual alarm signals can be sent out to inform maintenance personnel.