The invention discloses a fish tank improving ornamental and entertainment values. The fish tank comprises a fish tank and a fish tank control system arranged outside the fish tank. The fish tank control system comprises a central control unit and a flexible transparent organic light-emitting display screen connected to the central control unit. The fish tank control system also comprises an automatic monitoring unit, an automatic action unit, touch control buttons, a wireless module, a memory card interface and a music playing module respectively connected to the central control unit. According to the invention, the adopted flexible transparent organic light-emitting display screen can be bent according to the shape of the fish tank. Because the flexible transparent organic light-emitting display screen is a transparent part, when the screen does not display a specific image, the ornamental effect in the fish tank is not influenced. Also, the fish tank has various functions such as playing music, automatically monitoring various parameters of the fish tank, automatically adjusting the parameters of the fish tank, and wireless remote control. The fish tank is convenient to maintain.