A power switching device is provided. A first transmitting switch transmits an input voltage to an output node when the first transmitting switch is turned on. When the current passing through the first transmitting switch exceeds a predetermined value, a current limiting circuit turns off the first transmitting switch. When a short circuit occurs between the output node and a ground node, a short protection circuit turns off the first transmitting switch. The short protection circuit includes a first comparator and a first set circuit. The first comparator compares a voltage of the output node and a first reference voltage to generate a first comparison result to turn off the first transmitting switch. The first set circuit generates the first reference voltage according to the voltage of the output node. The first reference voltage is less than the voltage of the output node.