Drilling system capable of controlling micro flow and pressure

The utility model discloses a drilling system capable of controlling micro flow and pressure. The drilling system comprises a monitoring management platform, an automatic throttle manifold, a back-pressure pump and a hydraulic controller, wherein the monitoring management platform is used for acquiring data obtained by all valves, pressure sensors and flow meters on the automatic throttle manifold and the back-pressure pump, processing the acquired data, and outputting control instructions to the hydraulic controller according the processing results; the hydraulic controller is used for adjusting and controlling all the valves on the automatic throttle manifold and the back-pressure pump; the input end of the automatic throttle manifold is connected with a drilling rig and the back-pressure pump respectively, and the output end of the automatic throttle manifold is connected with a vertical pipe on a derrick; the automatic throttle manifold is mainly composed of a main control throttle passage, an auxiliary t