A current generating circuit for providing a plurality of load current is provided. The current generating circuit includes: a plurality of operational amplifier, coupled to a reference voltage source, wherein each positive input end of the a plurality of operational amplifier receives the reference voltage source; a plurality of semiconductor switch, used for controlling the output of a plurality of load current, wherein each semiconductor switch is respectively coupled to a corresponding operational amplifier and a load, and the semiconductor switch operates according to signals outputted from the output end of the corresponding operational amplifier to output the corresponding load current; and a control unit, coupled to a plurality of operational amplifier, for outputting a control signal to control the operation of a plurality of operational amplifier.