A mosquito killer includes a sonar module to detect a location of a mosquito, a low-power laser gun to emit a laser beam, a first reflecting mirror, a second reflecting mirror, and a controller. The first reflecting mirror reflects the laser beam to the second reflecting mirror. The second reflecting mirror is rotatable, and the controller is configured for receiving the location of the mosquito from the sonar module and controlling the second reflecting mirror to rotate to aim the laser beam to kill the mosquito.
