The invention discloses a constant static pressure energy-saving self-control system used for a lampblack concentrated discharging system. The constant static pressure energy-saving self-control system comprises a lampblack pressure sensor, a position sensor, a frequency conversion controller and a data analysis storage device; and the lampblack pressure sensor is arranged in a total pipe, the position sensor is used for recording the serial number of a smoke exhaust ventilator, the frequency conversion controller is used for controlling the running frequency of a draught fan, the data analysis storage device is formed by an analysis comparator and a storage device subject to data interaction with the analysis comparator, a pressure absolute value of a pressure signal of the analysis comparator is compared with a preset minimum negative pressure static pressure value, a frequency command transmitted to the frequency conversion controller is obtained through calculation, and a received serial number combination and the corresponding frequency command are stored in the storage device. By means of the constant static pressure energy-saving self-control system, changes of pressure in a pipe are used for controlling automatic frequency conversion operation of the draught fan, two control modes are achieved, the control accuracy is high, and the service life is long.