A discharging protection circuit of a battery, characterized in comprising at least one current limiting protection module, for limiting the current flowing through a load, and comprising: a first comparing unit, for judging whether the current flowing through a load exceeds a first discharging threshold value of the battery, and outputting a first electrical level when the current is more than the first discharging threshold value, or outputting a second electrical level when the current is less than or equal to the first discharging threshold value; and a current limiting unit, comprising a controlled switch and a current limiting power resistor connected to two ends of the controlled switch in parallel, wherein the controlled end of the controlled switch is connected to the first comparing unit, and enables the controlled switch to be disconnected when receiving a first electrical level, or enables the controlled switch to be switched on when receiving a second electrical level, the controlled switch of the current limiting unit comprises: a first resistor, a second resistor, a third resistor, a first N-channel MOS transistor, a second N-channel MOS transistor and a reference voltage source, wherein one end of the third resistor serves as the controlled end of the controlled switch, the other end is respectively connected to one end of the second resistor and the grid electrode of the second N-channel MOS transistor; the other end of the second resistor is respectively connected to the source electrode of the first N-channel MOS transistor and the source electrode of the second N-channel MOS transistor; the drain electrode of the second N-channel MOS transistor is respectively connected to the grid electrode of the first N-channel MOS transistor and one end of the first resistor; the other end of the first resistor is connected to the output end of a reference voltage source; and the source electrode and the drain electrode of the first N-channel MOS transistor serve as the input end and the output end of the controlled switch. a first comparing unit, for judging whether the current flowing through a load exceeds a first discharging threshold value of the battery, and outputting a first electrical level when the current is more than the first discharging threshold value, or outputting a second electrical level when the current is less than or equal to the first discharging threshold value; and a current limiting unit, comprising a controlled switch and a current limiting power resistor connected to two ends of the controlled switch in parallel, wherein the controlled end of the controlled switch is connected to the first comparing unit, and enables the controlled switch to be disconnected when receiving a first electrical level, or enables the controlled switch to be switched on when receiving a second electrical level, the controlled switch of the current limiting unit comprises: a first resistor, a second resistor, a third resistor, a first N-channel MOS transistor, a second N-channel MOS transistor and a reference voltage source, wherein one end of the third resistor serves as the controlled end of the controlled switch, the other end is respectively connected to one end of the second resistor and the grid electrode of the second N-channel MOS transistor; the other end of the second resistor is respectively connected to the source electrode of the first N-channel MOS transistor and the source electrode of the second N-channel MOS transistor; the drain electrode of the second N-channel MOS transistor is respectively connected to the grid electrode of the first N-channel MOS transistor and one end of the first resistor; the other end of the first resistor is connected to the output end of a reference voltage source; and the source electrode and the drain electrode of the first N-channel MOS transistor serve as the input end and the output end of the controlled switch.