The invention relates to a phase shift feeding device, and the device comprises a metal cavity and an integrated circuit board. The integrated circuit board comprises a substrate, a phase shift circuit, a feed line and a grounding layer. The metal cavity is of a U-shaped groove structure and is matched with the grounding layer to form a shielding cavity, thereby achieving the effect of a traditional phase shifter cavity. As the grounding layer serves as one side wall of the shielding cavity, the metal cavity saves one side wall when being compared with a traditional phase shifter cavity, thereby remarkably reducing the thickness and the weight of the metal cavity. In addition, the phase shift circuit and the feed circuit share a substrate to form the integrated circuit board. The integrated circuit board plays a role of the phase shift circuit board and a feed network board in a traditional phase shifter. Therefore, the phase shift feeding device is more compact in structure, and the thickness of the metal cavity can be further reduced. Therefore, the size of the phase shift feeding device is reduced, the structure is simplified, and the miniaturization of the antenna is favorablyrealized. In addition, the invention also provides an antenna.