The knitted fabric ironing device comprises an ironing table, a fixing support is fixedly connected to the middle of the ironing table, a heat conduction roller is installed in the middle of the fixing support, a supporting frame is fixedly connected to the top of the fixing support, two electric push rods are installed at the ends of the supporting frame, and the two electric push rods are connected with the heat conduction roller. The two electric push rods are oppositely arranged, the output ends of the electric push rods are fixedly connected with pressing rods, the side walls of the pressing rods are provided with two sliding grooves, the middles of the sliding grooves are fixedly connected with fixing rods, the middles of the fixing rods are slidably connected with sliding blocks, the middles of the sliding blocks are fixedly connected with first springs, and the ends of the first springs are fixedly connected to the tops of the sliding grooves; by means of the structure, the leveling rollers on the two sides move downwards and apply pressure to the knitted fabric, the knitted fabric can be subjected to uniform pressure in the ironing process, and the phenomena of wrinkles and unevenness of the knitted fabric in the ironing process are effectively reduced.