A hinge assembly, comprising: a base, provided with a guide groove; a first swing arm, comprising a first hinge connecting part and a first rotating part that are firmly connected, wherein the first hinge connecting part and the first rotating part are rotatable relative to the base around a first axis between the first hinge connecting part and the first rotating part, and the first axis is fastened relative to the base; a second swing arm, comprising a second hinge connecting part and a second rotating part that are firmly connected, wherein the second hinge connecting part and the second rotating part are rotatable relative to the base around a second axis between the second hinge connecting part and the second rotating part, the second axis is fastened relative to the base, and the second axis is parallel to the first axis; and a first and a second slider, each slider comprising a first fastening part, a second fastening part, and an extension part that are firmly connected, wherein the extension part is located in the guide groove, the first fastening part is movably connected to the first hinge connecting part, and the second fastening part is movably connected to the second hinge connecting part; and the first axis and the second axis are parallel to a first direction, and the extension part is movable in the guide groove in a second direction intersecting with the first direction, to drive the first swing arm and the second swing arm to rotate synchronously, wherein the first fastening part is provided with a first slide rail, the second fastening part is provided with a second slide rail, the hinge assembly further comprises a first pin and a second pin, the first pin penetrates the first slide rail and the first hinge connecting part, and the second pin penetrates the second slide rail and the second hinge connecting part; wherein the base comprises a first base block, a connecting block, and a second base block, the connecting block connects the first base block and the second base block, and the guide groove is located on the first base block and/or the second base block; and wherein the hinge assembly further comprises a first fastened rod and a second fastened rod, the first fastened rod is fastened to the first base block and the second base block, the second fastened rod is fastened to the first base block and the second base block, the first fastened rod penetrates a joint between the first hinge connecting part and the first rotating part, and the second fastened rod penetrates a joint between the second hinge connecting part and the second rotating part. a base, provided with a guide groove; a first swing arm, comprising a first hinge connecting part and a first rotating part that are firmly connected, wherein the first hinge connecting part and the first rotating part are rotatable relative to the base around a first axis between the first hinge connecting part and the first rotating part, and the first axis is fastened relative to the base; a second swing arm, comprising a second hinge connecting part and a second rotating part that are firmly connected, wherein the second hinge connecting part and the second rotating part are rotatable relative to the base around a second axis between the second hinge connecting part and the second rotating part, the second axis is fastened relative to the base, and the second axis is parallel to the first axis; and a first and a second slider, each slider comprising a first fastening part, a second fastening part, and an extension part that are firmly connected, wherein the extension part is located in the guide groove, the first fastening part is movably connected to the first hinge connecting part, and the second fastening part is movably connected to the second hinge connecting part; and the first axis and the second axis are parallel to a first direction, and the extension part is movable in the guide groove in a second direction intersecting with the first direction, to drive the first swing arm and the second swing arm to rotate synchronously, wherein the first fastening part is provided with a first slide rail, the second fastening part is provided with a second slide rail, the hinge assembly further comprises a first pin and a second pin, the first pin penetrates the first slide rail and the first hinge connecting part, and the second pin penetrates the second slide rail and the second hinge connecting part; wherein the base comprises a first base block, a connecting block, and a second base block, the connecting block connects the first base block and the second base block, and the guide groove is located on the first base block and/or the second base block; and wherein the hinge assembly further comprises a first fastened rod and a second fastened rod, the first fastened rod is fastened to the first base block and the second base block, the second fastened rod is fastened to the first base block and the second base block, the first fastened rod penetrates a joint between the first hinge connecting part and the first rotating part, and the second fastened rod penetrates a joint between the second hinge connecting part and the second rotating part.