The invention provides a numerically controlled groove milling machine capable of automatic material conveying and automatic detection, which includes a double vibrating plate feeding machine, a sound insulation cover, a support frame, a foot seat, a double-station workpiece inner hole through-gauge detection mechanism, and an electrical cabinet. Adjustable base, milling power head with lifting adjustment, workpiece feeding tube, workpiece clamping mechanism, machine base, feeding port, copper chip box, lifting base, double-station servo turntable mechanism, conveyor belt feeder, workpiece hydraulic pressure Cross-feed slide table, double-station waste unloading mechanism, waste box and double material channel selection unloading mechanism. The workpiece hydraulic cross-feed slide table of the present invention specifically adopts a cross dovetail groove slide table, which has a simple structure and is easy to maintain; the milling groove power head with lifting adjustment specifically adopts the front two and rear two bearings with the same shaft diameter and the lifting adjustment power head, which has high rigidity. The shaft end is thickened to prolong the service life.