The invention discloses a rotating feeding spindle head mechanism applicable to wire discharge grinding for micro electric spark machining. The rotating feeding spindle head mechanism comprises a machining feeding sliding block, a creep feeding piece, a hollow shaft motor, a first driving assembly, a pressure disc assembly, a normally-open clamp, a first bearing pedestal, a normally-closed clamp and a second driving assembly, wherein the hollow shaft motor and the first driving assembly are arranged on the creep feeding piece, and the first bearing pedestal is fixed to the machining feeding sliding block. The hollow shaft motor drives the pressure disc assembly to rotate. The first driving assembly drives a moving part of the pressure disc assembly to move up and down. The normally-open clamp comprises a normally-open rotating shaft and a normally-open clamping part. The moving part drives the normally-open clamping part to move up and down between the opening position and the closing position relative to the normally-open rotating shaft. The normally-closed clamp comprises a normally-closed rotating shaft and a normally-closed clamping part. The second driving assembly and the normally-closed clamp are matched so as to control the normally-closed clamping part to be opened or closed. Accordingly, thin and long electrode wires to be thinned can be clamped at a time, and the functions of creep feeding, high-precision rotation, rotation perigon positioning and the like of the thin and long electrode wires can be achieved.