The invention provides a speed chain intelligent optimization system during a tread extruding process and an optimization method thereof. The system comprises a double-layer multiobjective optimization subsystem, an empirical rule fuzzy PID self-adjusting subsystem, a tread running database and an intelligent coordinator. The optimization method comprises the following steps: the double-layer multiobjective optimization subsystem obtains a tread running speed by calculation according to an experimental parameter compensation model of operating data, a tread quality estimated value and a treadcontracting model during the tread extruding process; the empirical rule fuzzy PID self-adjusting subsystem adjusts the tread running speed; and finally the intelligent coordinator coordinates the output parameters of the double-layer multiobjective optimization subsystem and the empirical rule fuzzy PID self-adjusting subsystem to obtain the final optimization parameters. The invention can effectively control the speed chain during the tread extruding process so as to accord with an expected operating object, and local velocities can be matched well, thus improving the tread quality.