The invention discloses a method for realizing a fuzzy PID (Proportion Integration Differentiation) ActiveX control. The method comprises the following steps of: 1, setting a variable, a membership function of the variable, a fuzzy reasoning method and a de-fuzziness method; 2, setting a reasoning rule, determining the fuzzy values of e and ec to obtain accurate values kp, ki and kd after de-fuzzing a PID output variable, and establishing a fuzzy control decision polling list; and 3, compiling a fuzzy PID algorithm through VB (Visual Basic), and creating an ActiveX control. Due to the adoption of the control realizing method disclosed by the invention, the logical operation program of a fuzzy reasoning process is not required to be compiled any more during development, the output values deltaKP, deltaKI and deltakd of the fuzzy adjustment amount of a PID parameter which corresponds to a basic discourse domain are not required to be calculated according to a weighted average method, a program structure is simplified, the program executing period is shortened greatly, and the response speed of a system is increased.