The invention discloses an installation structure of a curtain. The structure comprises two adjusting plates, wherein the adjusting plates are parallelly fixed to the wall in an opposite mode, the adjusting plates are provided with first grooves, the inner walls of the two sides of each first groove are both provided with second grooves, the first grooves are internally provided with sliding blocks, the two sides, close to the second grooves, of each sliding block are both provided with third grooves, the third grooves are internally provided with fixed rods, all first fixed rods are fixedly connected with the inner walls of the two sides of each third groove, the outer side of each first fixed rod is sleeved with rolling wheels, the rolling wheels are rotatably connected with the fixed rods, part of the rolling wheels is located in the third grooves, the other part of the rolling wheels is located in the second grooves, the rolling wheels are connected with the inner walls of the second grooves in a rolling mode, the sides, away from the second grooves, of the sliding blocks are provided with fourth grooves, and the insides of the fourth grooves are provided with rolling balls. In the installation structure of the curtain, the adjusting plates are arranged, and the height of long rods for supporting the curtain can be conveniently adjusted, which makes it more convenient to dismantle and install the curtain.