A differential feed dual-polarized oscillator assembly comprises a radiator and a pair of balun support arms orthogonally connected to the radiator in a differential double-feed way. The radiator comprises two pairs of oscillator arms orthogonal to each other at 45 degrees and two orthogonal center of the two pairs of oscillator arms is provided with a cross-shaped short circuit plate. The front of each balun support arm is provided with a mirror-symmetrical microstrip balun along the center. The mirror symmetrical microstrip balun forms a group of differential double-feed lines. The back surface of each balun support arm is provided with a mirror-symmetrical grounding metal layer along the center. The oscillator arms and the short circuit plate are supported on the tops of the balun support arms. The oscillator arms are connected to the grounding metal layer. The short circuit plate is connected with the microstrip balun. Differentially doubly-feed is performed on the radiator so that the current distribution on the surface of the oscillator arms tends to be consistent. A directional diagram has good convergence, and high isolation, a high cross-polarization ratio and good impedance bandwidth are obtained. In addition, each pair of differential feed line terminal is subjected to short circuit and two polarized differential feed lines are subjected to crossed short circuit so that two polarization has a high degree of similarity.