The invention discloses a production method of super high breaking strength chinlon 66 industrial yarn. The production method comprises the steps of firstly, conducting solid-phase polymerizing tackifying on a chinlon 66 slice to obtain a high-viscosity slice; melting the obtained high-viscosity slice to obtain a melt; delivering the melt into a spinning box assembly to be filtered and measured insequence and conducting yarn jetting through a spinneret plate arranged in the assembly; cooling and forming an obtained tow, oiling the cooled tow and conducting homogenizing through an oil homogenizer; stretching to shape the homogenized tow and finally conducting winding to obtain the super high breaking strength chinlon 66 industrial yarn. The spinning box assembly comprises a sand box and aspinning assembly shell, one end of the sand box is opened, a melt inlet is formed in the middle of the other end of the sand box, and a filter screen, metal sand, a first metal fiber felt, a distributing plate, a second metal fiber felt, a first sealing ring and the spinneret plate are arranged from the melt inlet end in sequence; a second sealing ring is arranged in the melt inlet of the sand box. The chinlon 66 industrial yarn has super high breaking strength, and the strength of the chinlon 66 industrial yarn can reach 10.80 g/d or above.