A self-adaption current control circuit includes: a regulating transistor, a first sampling comparison circuit, a proportion control circuit, a variable sampling resistor, and a second sampling comparison circuit. The self-adaption current control circuit adjusts the resistance value of the variable sampling resistor and the coefficient of the proportion circuit simultaneously through the proportion control circuit. Meanwhile, the resistance value of the variable sampling resistor and the coefficient of the proportion circuit can be increased or decreased in the same proportion so that the input voltage of a second sampling comparison circuit can be in an appropriate input range.