A screen fastening device of a projection television having a front cabinet including a front window of a case, a screen for penetrating or forming an image, a fastening bracket for fastening the screen to the front cabinet, a mating portion for removably fastening the fastening bracket, which has one or more hooking protrusions formed on the fastening bracket, and a hooking protrusion receiving portion formed on the front cabinet to correspond to the hooking protrusion, to the front cabinet, and a supporting member for supporting and holding the fastening bracket for the mating portion to firmly fasten the fastening bracket to the front cabinet is provided. The screen fastening device can improve the workability and productivity as it can fasten or unfasten without using screws on the front surface of the projection television by the mating portion and the supporting member.