Disclosed in the present invention is a plastic greenhouse opening and closing pipe. As a plastic greenhouse opening and closing pipe which is installed along a longitudinal direction at both sides of a plastic greenhouse and ventilates the plastic greenhouse by rolling up a heat-retaining plastic covered on an outer circumferential surface of the plastic greenhouse according to operation of a switch, a plastic greenhouse opening and closing pipe according to the present invention includes: a pipe main body including a plurality of first connecting parts and second connecting parts which are formed in a predetermined length to form the opening and closing pipe, which are connected to each other along the length of the plastic greenhouse, which have predetermined lengths such that the first and second connecting parts are inserted and coupled to connecting portions that correspond to each other, and which are formed to transmit rotatory power in a longitudinal direction of the opening and closing pipe and a waterproof member which is inserted and coupled to inner parts of the first and second connecting parts, and which is installed to block inflow of water into the connecting portions of the pipe main body. A plastic greenhouse opening and closing pipe according to the present invention blocks inflow of water into the connecting portions of the pipe main body such that freeze and burst can be prevented in the wintertime and secure stiffness with respect to the connecting portions of the pipe main body such that rotatory power of the switch can be transmitted smoothly by respectively forming first connecting parts and second connecting parts having waveform cross sections on connecting portions of the pipe main body that correspond to each other, and providing the plastic greenhouse opening and closing pipe to inner parts of the first and second connecting parts in a state that the waterproof member is inserted and coupled to the plastic greenhouse opening and closin
