1. A constant current power supply with a plurality of current outputs for LED lamps, comprising:a DC/DC control module having overvoltage protection function and configured for controlling to output a constant current value;
an overvoltage detection circuit electrically connected to the DC/DC control module, the overvoltage detection circuit comprising two voltage sampling resistors connected in series;
a current sampling resistor connected in series in loop of the constant current power supply;
at least one output current conversion circuit connected in parallel with the current sampling resistor, the output current conversion circuit comprising a switch, a MOS transistor with a grid electrode electrically connected to the switch, and a current conversion sampling resistor electrically connected between a drain of the MOS transistor and an output of the constant current power supply, a source of the MOS transistor being grounded; and
at least one overvoltage protection resistor electrically connected between the output current conversion circuit and the overvoltage detection circuit, an overvoltage protection input of the DC/DC control module being electrically connected between two voltage sampling resistors, the overvoltage protection resistor connected in series between the two voltage sampling resistors and the grid electrode of the MOS transistor, each of output current conversion circuits being electrically connected to one overvoltage protection resistance.