A wireless power transmitter, which detects a load change in a wireless power transmission, includes a power supply unit, a power converter which converts the driving power supplied from the power supply unit into Alternating Current, a power transmitter which wirelessly transmits the converted driving power to the wireless power transmitter, a temperature measurement unit which measures a temperature of the wireless power transmitter; and a controller which detects a current and load value of the driving power output from the power supply unit, compensates for the load value based on the measured temperature value, and determines a load change of the power transmitter based on the compensated load value.