More recently, Bose-Einstein condensates of atoms with long-range and anisotropic dipolar atomic interaction are studied experimentally and theoretically. The dipole-dipole interaction can be either attractive orrepulsive. Therefore, it can induce various interesting phenomena, making dipolar Bose-Einstein condensates an ideal candidate for exploring a variety of novel experimental phenomena. In this paper, the interference of the dipolar Bose-Einstein condensates released from a double-well potential is investigated, and the influence of the polarization direction of dipolar atoms on the interference between dipolar Bose-Einstein condensates is studied via virtual time evolution method and time-splitting Fourier spectrum method. According to comparing the interference patterns of the different polarization direction of dipolar atoms, it’s found that, when the projection direction of the polarization vector of the dipolar atoms on the plane where the condensatesis located is symmetrical about the initial parting line of the two dipolar condensates, the interference patterns are also symmetrical about the parting line, and the chirality of vortices generated in the interference process is just opposite. When thedipolar atom interaction shows obvious anisotropy, the interference patterns have the following characteristics: when the projection direction of the polarization vector is parallel to the initial parting line of the two dipolar condensates, no vortex will be generated during the interference process, the interference fringes are straight and the fringe width is the same; when the angle between the projection direction of the polarization vector and the initial parting line of the two dipolar condensatesis close to /4 (or 3/4), visible vortices (or antivortices) distributed along a straight line will be formed in the central area of the interference pattern; when the angle between the projection direction of the polarization vector and theinitial parting line of the two dipolar condensates is close to /2, vortex-antivortex pairs will be formed in the central region of the interference pattern.