Abstract: A rotary positioning adjustment device includes a shaft sleeve and a connecting rod. A reel is fixedly connected with an end of the connecting rod; a fixed seat is sleeved on the connecting rod; the reel is arranged in the fixed seat; and a power storage assembly is installed in the shaft sleeve. The power storage assembly includes a power input piece, a second torsion spring and a power output piece; a first support leg of the second torsion spring is connected in a hooked mode with one side of an input block of the power input piece, and a second support leg of the second torsion spring is connected in a hooked mode with the other side of the input block. A curtain includes the rotary positioning adjustment device.