A rotary mechanism, comprising: a base, a first connector, a second connector, a lifting plate, a first torsion spring, and a second torsion spring, the first connector being rotatably connected to the base by a first rotary shaft, the second connector being rotatably connected to the base by a second rotary shaft, the second rotary shaft being parallel to the first rotary shaft, the lifting plate being located between the first connector and the second connector, the lifting plate comprising a fitting surface, the fitting surface being configured to fit a part of a foldable screen, the first torsion spring comprising a first spiral body and a first torsion arm, the first spiral body being sleeved on the first rotary shaft, the first torsion arm being located on a side of the lifting plate away from the fitting surface, one end of the first torsion arm being fixed to one end of the first spiral body, an other end of the first torsion arm being slidably connected to the lifting plate in a first direction, the second torsion spring comprising a second spiral body and a second torsion arm, the second spiral body being sleeved on the second rotary shaft, the second torsion arm being located on the side of the lifting plate away from the fitting surface, one end of the second torsion arm being fixed to one end of the second spiral body, an other end of the second torsion arm being slidably connected to the lifting plate in the first direction, the first direction being parallel to the lifting plate and being perpendicular to the first rotary shaft, the first connector and the second connector being rotatable between an unfolded position and a folded position relative to the base, in a case that the first connector and the second connector are rotated from the unfolded position to the folded position, the first torsion arm and the second torsion arm being driven to swing away from the fitting surface of the lifting plate, to drive the lifting plate to sink, in a case that the first connector and the second connector are rotated from the folded position to the unfolded position, the first torsion arm and the second torsion arm being driven to swing toward the fitting surface of the lifting plate, to drive the lifting plate to rise. the first connector being rotatably connected to the base by a first rotary shaft, the second connector being rotatably connected to the base by a second rotary shaft, the second rotary shaft being parallel to the first rotary shaft, the lifting plate being located between the first connector and the second connector, the lifting plate comprising a fitting surface, the fitting surface being configured to fit a part of a foldable screen, the first torsion spring comprising a first spiral body and a first torsion arm, the first spiral body being sleeved on the first rotary shaft, the first torsion arm being located on a side of the lifting plate away from the fitting surface, one end of the first torsion arm being fixed to one end of the first spiral body, an other end of the first torsion arm being slidably connected to the lifting plate in a first direction, the second torsion spring comprising a second spiral body and a second torsion arm, the second spiral body being sleeved on the second rotary shaft, the second torsion arm being located on the side of the lifting plate away from the fitting surface, one end of the second torsion arm being fixed to one end of the second spiral body, an other end of the second torsion arm being slidably connected to the lifting plate in the first direction, the first direction being parallel to the lifting plate and being perpendicular to the first rotary shaft, the first connector and the second connector being rotatable between an unfolded position and a folded position relative to the base, in a case that the first connector and the second connector are rotated from the unfolded position to the folded position, the first torsion arm and the second torsion arm being driven to swing away from the fitting surface of the lifting plate, to drive the lifting plate to sink, in a case that the first connector and the second connector are rotated from the folded position to the unfolded position, the first torsion arm and the second torsion arm being driven to swing toward the fitting surface of the lifting plate, to drive the lifting plate to rise.