A communications terminal, comprising a multiple-input multiple-output antenna system, wherein the multiple-input multiple-output antenna system comprises a first antenna module, a second antenna module, and a first ground structure; the first antenna module comprises a first radiator and a second radiator, and a first slit is provided between the first radiator and the second radiator; the second antenna module comprises a third radiator and a fourth radiator, and a second slit (S 2) is provided between the third radiator and the fourth radiator; the second radiator is connected to the third radiator, the first radiator is located on one side of the second radiator opposite to the third radiator, and the fourth radiator is located on one side of the third radiator opposite to the second radiator; the first radiator is configured to form a first MIMO antenna, and the fourth radiator is configured to form a second MIMO antenna; and one end of the first ground structure is connected to at least one of the second radiator and the third radiator, and another end is connected to at least one ground plane of the communications terminal, wherein the first ground structure is configured to increase isolation between the first antenna module and the second antenna module; wherein the first antenna module further comprises a first feeding port and a second feeding port; the first feeding port is connected to the first radiator, and is configured to feed a first signal source, and to form the first MIMO antenna together with the first radiator; and the second feeding port is connected to the second radiator, and is configured to feed a second signal source, and to form a GPS antenna together with the second radiator; the third radiator is configured to form a first low frequency communications antenna; the communications terminal includes a metal frame and a rear-cover ground plate, the metal frame includes a top metal frame, a bottom metal frame, a first-side metal frame, and a second-side metal frame, the first slit and the second slit are respectively provided at locations of the top metal frame; and the first ground structure includes a plurality of metal sheets, the plurality of metal sheets are disposed in parallel to the rear-cover ground plate of the communications terminal and aligned with each other and disposed at intervals in a direction perpendicular to the rear-cover ground plate. the first antenna module comprises a first radiator and a second radiator, and a first slit is provided between the first radiator and the second radiator; the second antenna module comprises a third radiator and a fourth radiator, and a second slit (S 2) is provided between the third radiator and the fourth radiator; the second radiator is connected to the third radiator, the first radiator is located on one side of the second radiator opposite to the third radiator, and the fourth radiator is located on one side of the third radiator opposite to the second radiator; the first radiator is configured to form a first MIMO antenna, and the fourth radiator is configured to form a second MIMO antenna; and one end of the first ground structure is connected to at least one of the second radiator and the third radiator, and another end is connected to at least one ground plane of the communications terminal, wherein the first ground structure is configured to increase isolation between the first antenna module and the second antenna module; wherein the first antenna module further comprises a first feeding port and a second feeding port; the first feeding port is connected to the first radiator, and is configured to feed a first signal source, and to form the first MIMO antenna together with the first radiator; and the second feeding port is connected to the second radiator, and is configured to feed a second signal source, and to form a GPS antenna together with the second radiator; the third radiator is configured to form a first low frequency communications antenna; the communications terminal includes a metal frame and a rear-cover ground plate, the metal frame includes a top metal frame, a bottom metal frame, a first-side metal frame, and a second-side metal frame, the first slit and the second slit are respectively provided at locations of the top metal frame; and the first ground structure includes a plurality of metal sheets, the plurality of metal sheets are disposed in parallel to the rear-cover ground plate of the communications terminal and aligned with each other and disposed at intervals in a direction perpendicular to the rear-cover ground plate.