The invention relates to a commercialized adjustable window screen which belongs to a building window anti-mosquito device. The invention aims to change the production and management mode of the traditional window screen and solves the problem of the commercialized production and management of the window screen. The commercialized adjustable window screen is mainly characterized in that the length of at least one of a window screen upper frame and a window screen lower frame is adjustable, and two window screen side frames are flexible frames; the height of a side net assembly can be adjusted in a cutting way; the width adjustment of the side net assembly is realized by setting a width series according to fixed width or realized in such a way that the width of an anti-mosquito net is designed in a cutting way; a special connecting piece or a joint point adjustable connecting piece can be adopted; a set of adjustable window screen upper frame and adjustable window screen lower frame or a plurality of sets of adjustable window screen upper frame and adjustable window screen lower frame with different adjusting ranges can be provided and adapted with the width adjustment of the side net assembly; and when the practical width of a window is larger than the set window width range, the problem can be solved by arranging two or a plurality of window screens in parallel. The invention is suitable for the mosquito prevention of the building window.