The invention discloses a pressure regulating device for a coke oven carbonization chamber and a fuzzy control method thereof. The method comprises the following steps: acquiring a state signal of the coke oven carbonization chamber, and judging the state of the coke oven carbonization chamber; acquiring the pressure value of the coke oven carbonization chamber; calculating deviation between the pressure set value and actual value and the deviation change rate; carrying out fuzzy treatment on the deviation and deviation change rate; and after the fuzzy PID (proportional-integral-derivative) operation, outputting a kinematic trajectory of a servo-cylinder, thereby controlling the pressure of the coke oven carbonization chamber to fluctuate within a small set value range. The fuzzy control method disclosed by the invention overcomes the defect of complex and unstable pressure of the coke oven carbonization chamber, and has the advantages of strong system robustness, quick reaction speed and high antijamming capability.