Automatic splash-proof device for wellhead drilling fluid

The invention relates to the technical field of drilling fluid splash-proof device for oilfield wellhead, specifically an automatic splash-proof device for wellhead drilling fluid, comprising a gas source, a gas storing tank, a one-way valve, an electric control device, an inflatable pneumatic valve, a pressure relief pneumatic valve and a three-way joint; the gas outlet of the gas source is connected with the gas inlet of the gas storing tank by a high-pressure pipeline; the gas outlet of the gas storing tank is connected with the gas inlet of the one-way valve by the high-pressure pipeline; the gas outlet of the one-way valve is connected with the gas inlet of the inflatable pneumatic valve by the high-pressure pipeline; the structure of the invention is reasonable and compact; the existing resources including gas source and power source in the well site are used; under condition that the existing single root picking operation procedure is not influenced and safety is ensured, mechatronic control system is adopted, the compressed air is used for pressing the drilling liquid in the drilling pole under the drilling platform, which brings safer and clean protection to the drilling work; the invention is featured in safety, reliability, simple and easy operation, and convenience.