To provide a gas forced feeding oil-cooled screw compressor which can secure proper oil charging amount to a compressor main body.

In this type of gas forced feeding oil-cooled screw compressor, a pressure control valve 21 is arranged on an oil supply flow passage 17A between a branch point of an oil supply passage 17 and an oil injection point inside a first compressor main body 2. In addition, a control piping 22 is arranged for transmitting the pressure in a discharge passage 9 between the first compressor main body 2 and a second opening/closing valve 6 to the valve driving part of the pressure control valve 21, and as the pressure is lowered, operating the valve disc driving part of the pressure control valve 21 so as to indensify pressure reduction by the pressure control valve 21.