The invention relates to the field of communication, and discloses an antenna system and a mobile terminal. The antenna system comprises a first antenna radiation part, a second antenna radiation partand a circuit board, wherein the circuit board is provided with a first radio frequency switch, a second radio frequency switch, a first matching circuit, a second matching circuit, a feeding point,a first grounding point and a second grounding point, the feeding point is electrically connected with the first antenna radiation part so as to achieve feeding of the first antenna radiation part, one end of the first radio frequency switch is electrically connected to the first grounding point, the other end of the first radio frequency switch is connected to the first antenna radiation part byconnecting the first matching circuit so as to achieve grounding of the first antenna radiation part, one end of the second radio frequency switch is electrically connected to the second grounding point, the other end of the second radio frequency switch is connected to the second antenna radiation part by connecting the second matching circuit so as to achieve grounding of the second antenna radiation part, and the second antenna radiation part and the first antenna radiation part are arranged at intervals to achieve electromagnetic coupling. The antenna system and the mobile terminal, provided by the invention, have wide frequency band and high performance and are simultaneously low in implement cost.