The invention relates to a digitally controlled charger with a protection function. The digitally controlled charger with the protection function comprises a digital control module, a charging voltagedatabase, a charging current database, a selection module, a power module and an output protection module, wherein the selection module is used for selecting required charging voltage or charging current and outputting corresponding charging voltage data and overcharging current data; the power module is coupled to the commercial power to perform voltage reduction processing and output voltage data or current data after voltage reduction; and the output protection module receives the voltage data and the charging voltage data after voltage reduction, or compares the current data and the charging current data after voltage reduction, and outputs comparison data to the digital control module. According to the digitally controlled charger with the protection function, the output protection module compares the voltage or current after voltage reduction with the selected charging voltage or current, and cuts off a charging circuit when the voltage and current after voltage reduction are different from the selected charging voltage and current, and the situation that the damage of the object to be charged or incapability of charging due to the fact that the voltage and current after voltage reduction is too high or too low is reduced.