The invention is to provide an input-current-type analog resistor and a resistance control method thereof. The analog resistor comprises a current source, a current-voltage converter, an AD converter, a processor, a DA converter and a voltage-voltage converter, which are connected in series in sequence. In the resistance simulation process, in such circuits above, errors are mainly caused by the current-voltage converter, the AD converter, the DA converter and the voltage-voltage converter; and the errors can be eliminated through final analog resistance error analysis, error elimination in the embedded processor as well as calibration fitting, thereby improving precision of the finally-out analog resistance and resistance stability.