Abstract: Disclosed is a fiber sheet having a heat-treated surface layer, comprising a polyester fiber applicable as heat insulating and sound absorbing materials. The fiber sheet is prepared by forming a surface layer at a particular level by continuously heat-treating a surface of the fiber sheet using 1 to 3 sets of hot press rollers at a post-process, where one set of the rollers consists of two rollers vertically arranged. Compared to the conventional products, the fiber sheet of the present invention has improved desurfacing property and bending strength, and good workability and interior property, as well as having improved texture, sound absorbing property and moisture resistance by regulating the size of surface pores.