Drilling fluid on-line automatic preparation system and method while drilling

The invention discloses a drilling fluid on-line automatic preparation system and method, and relates to the technical field of geological drilling engineering drilling fluid on-line automatic preparation, the drilling fluid on-line automatic preparation system comprises a feeding unit, a stirring unit, a monitoring unit and a control unit, the feeding unit is used for adding raw materials in a quantitative, constant-speed, sequenced and timed manner; the stirring unit comprises a pulping tank, an emulsifying pump and a stirrer arranged in the pulping tank, an inlet of the emulsifying pump is communicated with a bottom outlet of the pulping tank, and an outlet of the emulsifying pump is communicated with a top inlet of the pulping tank; an outlet of the diaphragm pump is communicated with the pulping tank; the monitoring unit is used for monitoring the performance of the drilling fluid in the pulping tank; the control unit comprises a time sequence controller; and a controller of the diaphragm pump, each elec