In the field of microwave power transmission, when the polarization mismatch between receiving antenna and transmitting antenna occurs, the energy received by rectifier antenna will decrease sharply. A dual polarized slot receiving antenna with harmonic suppression function at 2.45 GHz is designed. The receiving antenna can receive energy even when it rotates at a certain angle. The horizontal and vertical polarization of the antenna can be realized by opening a suitable size and symmetrical structure slot on the patch, and the harmonic suppression function can be realized by using defected ground structure. The simulation results show that at 2.45 GHz, the isolation degree of the antenna is higher than 17.6 dB, the gain is 3.9 dBi and the impedance matching is good. The echo loss of the antenna at the second and third harmonics is -0.38 dB and -0.96 dB. The simulation results are in good agreement with the measured ones.