The utility model discloses an automatic throttle manifold system which comprise a throttle manifold and a hydraulic control system, wherein the throttle manifold comprises an open flow channel, a main throttle channel, an auxiliary throttle channel and an overflow pressure regulation channel; and the six-way block of the throttle manifold is provided with a pressure sensor. The electrohydraulic pressure control valve of the hydraulic control system can be a proportional overflow valve or a servo valve. Through adoption of the system, precise well mouth back pressure control (including pump starting and stopping and venting overflow) required in the whole well drilling process can be realized, flow switching among all well drilling working procedures can be finished; and the automatic throttle manifold system has a function of metering fluid flow.