A power supply output parameter self-adjusting system of an identified load, comprising a variable parameter power supply and said identified load, wherein the variable parameter power supply is electrically connected with the identified load, the variable parameter power supply comprises a power supply driving module and a power supply control module, the power supply driving module is electrically connected with the power supply control module, and the identified load comprises a load and an identification module; wherein the power supply control module comprises a detection end and a signal output end, the detection end is connected with the identification module, the signal output end is connected with the power supply driving module, and an output end of the power supply driving module is connected with the load and the identification module respectively; the power supply control module is configured to detect the identification module, and send a control signal to the power supply driving module according to a detection result, and the power supply driving module is configured to output a corresponding parameter according to the control signal; the identification module comprises a resistor module connected in parallel with the load; the load comprises an input positive end and an output negative end, one end of the resistor module is connected with the input positive end of the load, the other end of the resistor module is connected with the output negative end of the load, the input positive end of the load is further connected with a positive electrode of the output end of the power supply driving module, characterised in that the power supply control module further comprises a control end, the output negative end of the load is further connected with the control end, a second switch is provided between the output negative end of the load and the control end, and the detection end of the power supply control module is connected between the output negative end of the load and the second switch; and the resistor module comprises a first branch and at least one second branch, the first branch is connected in parallel with the at least one second branch, all of the second branches are connected in parallel with each other, the first branch comprises a second resistor, each one of the at least one second branch comprises a third resistor and a voltage stabilizing diode, a positive electrode of the voltage stabilizing diode is connected with the positive electrode of the output end of the power supply driving module, and a negative electrode of the voltage stabilizing diode is connected with the third resistor. wherein the power supply control module comprises a detection end and a signal output end, the detection end is connected with the identification module, the signal output end is connected with the power supply driving module, and an output end of the power supply driving module is connected with the load and the identification module respectively; the power supply control module is configured to detect the identification module, and send a control signal to the power supply driving module according to a detection result, and the power supply driving module is configured to output a corresponding parameter according to the control signal; the identification module comprises a resistor module connected in parallel with the load; the load comprises an input positive end and an output negative end, one end of the resistor module is connected with the input positive end of the load, the other end of the resistor module is connected with the output negative end of the load, the input positive end of the load is further connected with a positive electrode of the output end of the power supply driving module, characterised in that the power supply control module further comprises a control end, the output negative end of the load is further connected with the control end, a second switch is provided between the output negative end of the load and the control end, and the detection end of the power supply control module is connected between the output negative end of the load and the second switch; and the resistor module comprises a first branch and at least one second branch, the first branch is connected in parallel with the at least one second branch, all of the second branches are connected in parallel with each other, the first branch comprises a second resistor, each one of the at least one second branch comprises a third resistor and a voltage stabilizing diode, a positive electrode of the voltage stabilizing diode is connected with the positive electrode of the output end of the power supply driving module, and a negative electrode of the voltage stabilizing diode is connected with the third resistor.