A remote-controlled sight of a firearm has an aiming unit and a remote-controlled unit. The aiming unit is detachably disposed on a firearm body of the firearm and the remote-controlled unit connects to the firearm body. The remote-controlled unit has a button, a wireless transmitting module and a wireless receiving module, the wireless transmitting module is electrically connected to the button and the wireless receiving module is electrically connected to the aiming unit. When the button is pressed, a signal is transmitted from the wireless transmitting module and received by the wireless receiving module to actuate the aiming unit.