A locking assembly, comprising: a retainer provided with first and second sliding grooves (111, 112) which are oppositely arranged and in communication with each other, the first fastening sheet moving in the first sliding groove, and the second fastening sheet moving in the second sliding groove; a hinge shaft capable of moving in the first and second sliding grooves (111, 112); and a fastener having first and second fastening sheets (21, 22) separately hinged to the hinge shaft, the fastener having a relative disengagement state and a relative engagement state, each fastener being capable of being accommodated in the retainer when in the relative disengagement state and being provided with a limiting structure for keeping the fastener at a specific disengagement angle, the locking assembly further comprising an actuating positioner, the actuating positioner being connected to the fastener and capable of driving the fastener to move and keeping the fastener at a specific position, wherein the actuating positioner comprises a bolt and a threaded through hole radially formed in the hinge shaft, the bolt penetrating the retainer to be connected to the threaded through hole characterised in that the first fastening sheet and the second fastening sheet comprise first hinge plates and second hinge plates which are oppositely arranged, and connecting plates for connecting the first hinge plate to the second hinge plate, parts, close to hinge ends, of the connecting plates of the first fastening sheet and the second fastening sheet being provided with cut grooves separately; and the limiting structure enabling an end part of the hinge end of the first hinge plate of the first fastening sheet to be in abutting fit with a bottom of the cut groove of the second fastening sheet, and an end part of the hinge end of the first hinge plate of the second fastening sheet to be in abutting fit with a bottom of the cut groove of the first fastening sheet, the first sliding groove being provided with a first inclined guide surface for engaging the first fastening sheet relative to the second fastening sheet, the second sliding groove being provided with a second inclined guide surface for engaging the second fastening sheet relative to the first fastening sheet, the first inclined guide surface being disposed opposite the second inclined guide surface. a retainer provided with first and second sliding grooves (111, 112) which are oppositely arranged and in communication with each other, the first fastening sheet moving in the first sliding groove, and the second fastening sheet moving in the second sliding groove; a hinge shaft capable of moving in the first and second sliding grooves (111, 112); and a fastener having first and second fastening sheets (21, 22) separately hinged to the hinge shaft, the fastener having a relative disengagement state and a relative engagement state, each fastener being capable of being accommodated in the retainer when in the relative disengagement state and being provided with a limiting structure for keeping the fastener at a specific disengagement angle, the locking assembly further comprising an actuating positioner, the actuating positioner being connected to the fastener and capable of driving the fastener to move and keeping the fastener at a specific position, wherein the actuating positioner comprises a bolt and a threaded through hole radially formed in the hinge shaft, the bolt penetrating the retainer to be connected to the threaded through hole characterised in that the first fastening sheet and the second fastening sheet comprise first hinge plates and second hinge plates which are oppositely arranged, and connecting plates for connecting the first hinge plate to the second hinge plate, parts, close to hinge ends, of the connecting plates of the first fastening sheet and the second fastening sheet being provided with cut grooves separately; and the limiting structure enabling an end part of the hinge end of the first hinge plate of the first fastening sheet to be in abutting fit with a bottom of the cut groove of the second fastening sheet, and an end part of the hinge end of the first hinge plate of the second fastening sheet to be in abutting fit with a bottom of the cut groove of the first fastening sheet, the first sliding groove being provided with a first inclined guide surface for engaging the first fastening sheet relative to the second fastening sheet, the second sliding groove being provided with a second inclined guide surface for engaging the second fastening sheet relative to the first fastening sheet, the first inclined guide surface being disposed opposite the second inclined guide surface.