A vertical curtain assembly made of a multifunctional multilayer composite sheet material, comprising a curtain lamina made of a multifunctional multilayer composite sheet material, a top retaining member disposed on top of the curtain lamina and configured to receive the curtain lamina and to suspend the curtain lamina onto a curtain rail, and a counterweight portion disposed at a bottom of the curtain lamina and configured to receive the curtain lamina and stabilize the curtain lamina, wherein the top retaining member comprises a first holding piece, having connecting edges, a second holding piece, having connecting edges, a top fastener, and a top fixing device, wherein the connecting edges of the first holding piece and the second holding piece are pivotally connected by a top connecting device, thereby pivoting between an open position of the top retaining member and a closed position for gripping the top of the curtain lamina, the top fastener being configured to detachably lock the top retaining member in the closed position, the top fixing device being configured to secure the curtain lamina within the top retaining member, characterised in that the counterweight portion comprises a first vertical weight piece, having connecting edges, a second vertical weight piece, having connecting edges, a bottom fastener and a bottom fixing device, and the connecting edges of the first vertical weight piece and the second vertical weight piece are pivotally connected by a bottom connecting device, thereby pivoting between an open position of the counterweight portion and a closed position for gripping the bottom of the curtain lamina, the bottom fastener being configured to detachably lock the counterweight portion in the closed position, the bottom fixing device being configured to secure the curtain lamina within the counterweight portion, wherein, the top fixing device comprises at least one opening respectively disposed on the first holding piece and the second holding piece, and a set of interlocking teeth (212, 213) disposed at the at least one opening and configured to secure the top of the curtain lamina; and/or the bottom fixing device comprises at least one opening respectively disposed on the first vertical weight piece and the second vertical weight piece, and a set of interlocking teeth (312, 313) disposed at the at least one opening for securing the bottom of the curtain lamina. the top retaining member comprises a first holding piece, having connecting edges, a second holding piece, having connecting edges, a top fastener, and a top fixing device, wherein the connecting edges of the first holding piece and the second holding piece are pivotally connected by a top connecting device, thereby pivoting between an open position of the top retaining member and a closed position for gripping the top of the curtain lamina, the top fastener being configured to detachably lock the top retaining member in the closed position, the top fixing device being configured to secure the curtain lamina within the top retaining member, characterised in that the counterweight portion comprises a first vertical weight piece, having connecting edges, a second vertical weight piece, having connecting edges, a bottom fastener and a bottom fixing device, and the connecting edges of the first vertical weight piece and the second vertical weight piece are pivotally connected by a bottom connecting device, thereby pivoting between an open position of the counterweight portion and a closed position for gripping the bottom of the curtain lamina, the bottom fastener being configured to detachably lock the counterweight portion in the closed position, the bottom fixing device being configured to secure the curtain lamina within the counterweight portion, wherein, the top fixing device comprises at least one opening respectively disposed on the first holding piece and the second holding piece, and a set of interlocking teeth (212, 213) disposed at the at least one opening and configured to secure the top of the curtain lamina; and/or the bottom fixing device comprises at least one opening respectively disposed on the first vertical weight piece and the second vertical weight piece, and a set of interlocking teeth (312, 313) disposed at the at least one opening for securing the bottom of the curtain lamina.