A feeding network for a base station antenna, including: a first phase shifter, a second phase shifter, a third phase shifter, and a fourth phase shifter; a 3-way power divider comprising an input terminal for connecting to a feeding port input, a first output terminal for feeding a central unit of the base station antenna, and second and third output terminals connected with the first and second phase shifters respectively; a first 2-way power divider comprising an input terminal connected with the output terminal of the first phase shifter, a first output terminal for feeding the base station antenna, and a second output terminal for connecting with an input terminal of the third phase shifter; and a second 2-way power divider comprising an input terminal connected with the output terminal of the second phase shifter, a first output terminal for feeding the base station antenna, and a second output terminal for connecting with an input terminal of the fourth phase shifter; wherein: the phase shifters each include a fixed transmission line and a sliding transmission line, wherein movement of the sliding transmission line changes the length of a transmission line formed by the fixed transmission line and the sliding transmission line, wherein each fixed transmission line comprises two hollow round metal tubes (200, 300) and each sliding transmission line is a U-shaped metal rod coated with an insulation layer on the surface and is inserted into the hollow round metal tubes (200, 300); and the feeding network further comprises an integrally formed metal cavity structure having a long side, wherein the phase shifters and the power dividers are placed in the integrally formed metal cavity structure, and the first output terminals of the power dividers are distributed evenly along the long side of the metal cavity structure. a first phase shifter, a second phase shifter, a third phase shifter, and a fourth phase shifter; a 3-way power divider comprising an input terminal for connecting to a feeding port input, a first output terminal for feeding a central unit of the base station antenna, and second and third output terminals connected with the first and second phase shifters respectively; a first 2-way power divider comprising an input terminal connected with the output terminal of the first phase shifter, a first output terminal for feeding the base station antenna, and a second output terminal for connecting with an input terminal of the third phase shifter; and a second 2-way power divider comprising an input terminal connected with the output terminal of the second phase shifter, a first output terminal for feeding the base station antenna, and a second output terminal for connecting with an input terminal of the fourth phase shifter; wherein: the phase shifters each include a fixed transmission line and a sliding transmission line, wherein movement of the sliding transmission line changes the length of a transmission line formed by the fixed transmission line and the sliding transmission line, wherein each fixed transmission line comprises two hollow round metal tubes (200, 300) and each sliding transmission line is a U-shaped metal rod coated with an insulation layer on the surface and is inserted into the hollow round metal tubes (200, 300); and the feeding network further comprises an integrally formed metal cavity structure having a long side, wherein the phase shifters and the power dividers are placed in the integrally formed metal cavity structure, and the first output terminals of the power dividers are distributed evenly along the long side of the metal cavity structure. the phase shifters each include a fixed transmission line and a sliding transmission line, wherein movement of the sliding transmission line changes the length of a transmission line formed by the fixed transmission line and the sliding transmission line, wherein each fixed transmission line comprises two hollow round metal tubes (200, 300) and each sliding transmission line is a U-shaped metal rod coated with an insulation layer on the surface and is inserted into the hollow round metal tubes (200, 300); and the feeding network further comprises an integrally formed metal cavity structure having a long side, wherein the phase shifters and the power dividers are placed in the integrally formed metal cavity structure, and the first output terminals of the power dividers are distributed evenly along the long side of the metal cavity structure.