The invention relates to a B3/L1 dual-mode satellite navigation antenna adopting double-headed arrow anchor-type loading, and relates to a satellite navigation antenna. The B3/L1 dual-mode satellite navigation antenna comprises a dielectric substrate, which adopts a square dielectric substrate. The upper surface and the lower surface of the dielectric substrate are respectively provided with a good conductor layer, and the upper surface good conductor layer is provided with a square radiation patch used for loading a double-headed arrow. The four corners of the square radiation patch are provided with double-headed arrow anchor-type gaps in a loaded manner. The arrows are in an axial-symmetric arrangement, and an included angle between one arrow and a connecting arm is in a range from 45 degrees plus or minus 2degrees. The intervals between the outer edges of the gaps and the edges of the radiation patch are in a range from 0.8 to 1.2mm, and the intervals between the outer edges and the inner edges of the gaps are in a range from 10 to 15mm, and the widths of the gaps are in a range from 1.0mm to 1.5mm. The double-headed arrow anchor-type gaps having the narrow widths are embedded in the gaps, and outer arrows of anchor-type structures are connected with the radiation patch, and the inner arrows of the anchor-type structures are not connected with the radiation patch. The B3/L1 dual-mode satellite navigation antenna is advantageous in that adjustability of resonance length is effectively improved, and according to a frequency demand, the lengths of the arrows are adjusted, and therefore a design of a dual-mode circular polarization high precision satellite antenna is acquired.