A foldable hinge, comprising: a base ; and two folding assemblies on both sides of the base and coupled to the base , the two folding assemblies being foldable relative to each other, wherein each folding assembly comprises a rotating arm and a support member , a first end of the rotating arm being rotatably coupled to the base , the support member being rotatably coupled to a second end of the rotating arm away from the base , a side of the support member close to the base being rotatably coupled to the base , and the support member being slidable in a direction towards or away from the base ; and wherein, when bringing the two folding assemblies together, a distance (L1) between portions of the two support members coupled to the rotating arms is smaller than a distance (L2) between portions of the two support members coupled to the base , wherein a surface of the base coupled to the folding assembly comprises a first circular arc groove , the rotating arm comprises a first body portion and a first arc arm , an end of the first arc arm being coupled to the first body portion , and the first arc arm being in the first circular arc groove and being slidable along the first circular arc groove , characterized in that : the surface of the base further comprises a first recess , the first recess is on a side of the first circular arc groove , and a side wall of the first recess has a pin shaft , the support member comprises a connection block , the connection block of the support member is in the first recess , and the pin shaft is in a first guiding sliding slot of the connection block . a base ; and two folding assemblies on both sides of the base and coupled to the base , the two folding assemblies being foldable relative to each other, wherein each folding assembly comprises a rotating arm and a support member , a first end of the rotating arm being rotatably coupled to the base , the support member being rotatably coupled to a second end of the rotating arm away from the base , a side of the support member close to the base being rotatably coupled to the base , and the support member being slidable in a direction towards or away from the base ; and wherein, when bringing the two folding assemblies together, a distance (L1) between portions of the two support members coupled to the rotating arms is smaller than a distance (L2) between portions of the two support members coupled to the base , wherein a surface of the base coupled to the folding assembly comprises a first circular arc groove , the rotating arm comprises a first body portion and a first arc arm , an end of the first arc arm being coupled to the first body portion , and the first arc arm being in the first circular arc groove and being slidable along the first circular arc groove , characterized in that : the surface of the base further comprises a first recess , the first recess is on a side of the first circular arc groove , and a side wall of the first recess has a pin shaft , the support member comprises a connection block , the connection block of the support member is in the first recess , and the pin shaft is in a first guiding sliding slot of the connection block . the surface of the base further comprises a first recess , the first recess is on a side of the first circular arc groove , and a side wall of the first recess has a pin shaft , the support member comprises a connection block , the connection block of the support member is in the first recess , and the pin shaft is in a first guiding sliding slot of the connection block . <EOS>