An antenna system, comprising: a first feed point, a first ground point, a second feed point, a second ground point, a third ground point, a fourth ground point, a first radiator, a second radiator, a first resonance structure, and a second resonance structure, wherein the first ground point, the second ground point, the third ground point, and the fourth ground point are located on a mainboard ground of the antenna system; the first feed point is connected to the first radiator, and the first feed point is configured to transmit a high frequency signal and a first low frequency signal to the first radiator; the second feed point is connected to the second radiator, and the second feed point is configured to transmit an intermediate frequency signal and a second low frequency signal to the second radiator; the first radiator is connected to the first ground point, and the second radiator is connected to the second ground point; and a frequency of the second low frequency signal is greater than a frequency of the first low frequency signal; and a first slot is located between the first resonance structure and the first radiator, the first resonance structure is electromagnetically coupled to the first radiator via the first slot, a second slot is located between the second resonance structure and the second radiator, the second resonance structure is electromagnetically coupled to the second radiator via the second slot, the first resonance structure is connected to the third ground point, and the second resonance structure is connected to the fourth ground point, wherein the first radiator comprises a first part of a lower frame of a terminal device, the second radiator comprises a second part of the lower frame of the terminal device, and a third slot is located between the first part and the second part; the first resonance structure comprises a part of a first side frame of the terminal device, and the second resonance structure comprises a part of a second side frame of the terminal device; wherein the first slot is located on the lower frame of the terminal device, and/or the second slot is located on the lower frame of the terminal device. the first feed point is connected to the first radiator, and the first feed point is configured to transmit a high frequency signal and a first low frequency signal to the first radiator; the second feed point is connected to the second radiator, and the second feed point is configured to transmit an intermediate frequency signal and a second low frequency signal to the second radiator; the first radiator is connected to the first ground point, and the second radiator is connected to the second ground point; and a frequency of the second low frequency signal is greater than a frequency of the first low frequency signal; and a first slot is located between the first resonance structure and the first radiator, the first resonance structure is electromagnetically coupled to the first radiator via the first slot, a second slot is located between the second resonance structure and the second radiator, the second resonance structure is electromagnetically coupled to the second radiator via the second slot, the first resonance structure is connected to the third ground point, and the second resonance structure is connected to the fourth ground point, wherein the first radiator comprises a first part of a lower frame of a terminal device, the second radiator comprises a second part of the lower frame of the terminal device, and a third slot is located between the first part and the second part; the first resonance structure comprises a part of a first side frame of the terminal device, and the second resonance structure comprises a part of a second side frame of the terminal device; wherein the first slot is located on the lower frame of the terminal device, and/or the second slot is located on the lower frame of the terminal device.