The present application discloses a portable curtain cutter assembly comprising a base and a portable cutter. The base comprises a supporting plate; a side wall; and a slider. The side all is coupled to the supporting plate and comprises a first groove. The slider is slidably coupled to the side wall through the first groove, wherein the slider comprises a slot. The portable cutter comprises a blade, wherein the blade is capable of being inserted partially into the slot. A method or using the aforementioned portable curtain cutter assembly is also disclosed.