Device for guiding a fabric, especially designed to be used with retractable screens like for example pleaded anti-mosquito screens, which includes two vertical rigid elements facing each other, one of them fixed (2) and the other one mobile (1) and the latter being able to slide from a starting position where it is in contact with the fixed element or near this fixed element, to a final position, moving farther away from the fixed element. The mechanism that allows opening the screen also includes the upper flexible element (4), which is connected to the fixed part (2) and an intermediate flexible element (5) that is in turn connected to a lower flexible element (6) that attaches to the fixed element (2). The mechanism is linear, which simplifies the assembling of the device. It also easily adapts to openings of different sizes, which are to be protected with the retractable screen.