The utility model discloses a unginned cotton pretreatment automation control system. The system comprises a frequency converter, a controller, a touch screen, a plurality of cotton storage quantity sensors and a unit detection control circuit. The touch screen is connected with the controller. The controller is connected with an automatic flower feeding machine through the frequency converter. The controller is connected with each processing machinery power supply circuit through the unit detection control circuit. Output terminals of the cotton storage quantity sensors are connected with an input terminal of the controller. According to the system of the utility model, a current sensor and a rotating speed sensor are used to detect an operation state of each processing machine in the unginned cotton pretreatment system. When the processing machine has a fault, the current sensor and the rotating speed sensor convey a fault signal to the controller. The controller makes the processing machine which has the fault be suspended through a relay so that a quality problem and a machinery damage caused by fault operation are avoided. Simultaneously, the frequency converter controls a flower feeding speed of the automatic flower feeding machine so that the automatic flower feeding machine does not feed flowers quickly and a phenomenon of cotton plugging is avoided.