A quick-release structure for a frame rod of a tent includes an upper rod, a middle rod, a lower rod, an upper joint, a lower joint and a quick-release assembly. The upper joint includes a first joint head and a second upper joint head. The first upper joint head is connected to the upper rod, and the second upper joint head is connected to the middle rod. The first upper joint head includes an eccentric cam. The lower joint includes a first lower joint head and second lower joint heads. The first lower joint head is connected to the middle rod, and the second lower joint head is connected to the lower rod. The quick-release assembly includes a pipe, a pulley, a pulley seat, an upper pin, an upper spring, a lower pin and a lower spring.