A garden hose ON/OFF timer unit with a viewing angle adjustable display panel comprising a main body, an ON/OFF valve assembly, a fixed mount, a movable base and a timer, wherein the main body has a water inlet and a water outlet extending from two opposite ends of a central portion thereof and a valve tube being arranged between the water inlet and the water outlet and extending from a side of the central portion of the main body, the ON/OFF valve assembly being mounted on the valve tube and the operation of the ON/OFF valve assembly is controlled by the timer so that the water passage in the main body can be opened and closed by switching the ON/OFF valve assembly on and off; the fixed mount is fastened on the central portion of the main body in such a way that the water inlet, the water outlet and the valve tube all extend out of the fixed mount, wherein the movable base is pivotably connected to the fixed mount at a position corresponding to the position of the valve tube, so that the movable base is capable of pivoting on the fixed mount; and the timer is mounted in the movable base and provided with a display panel and an operational interface operated by pressing keys, the display panel and the operational interface being exposed on the movable base, the timer being movable together with the movable base when pivoting the movable base with respect to the fixed mount for adjusting a viewing angle for the display panel; characterized in that the fixed mount defines a projecting seat in a position corresponding to the position of the valve tube, wherein the projecting seat is provided with a through hole for passing the valve tube therethrough and a bushing, wherein a plurality of positioning recesses is arranged annularly on the external wall of the bushing, the bushing of the fixed mount being inserted into a corresponding opening defined on the movable base, wherein the movable base further defines a positioning hole, wherein a second spring and a positioning pin to be pushed outwards by the second spring are set in the positioning hole, wherein the positioning hole of the movable base and the bushing of the fixed mount are correspondingly arranged, such that the positioning pin is elastically inserted into a corresponding one of the plurality of positioning recesses, so that after pivoting to a desired viewing angle, the movable base is fixed in its corresponding position through elastic engagement of the positioning pin in the corresponding positioning recess. the main body has a water inlet and a water outlet extending from two opposite ends of a central portion thereof and a valve tube being arranged between the water inlet and the water outlet and extending from a side of the central portion of the main body, the ON/OFF valve assembly being mounted on the valve tube and the operation of the ON/OFF valve assembly is controlled by the timer so that the water passage in the main body can be opened and closed by switching the ON/OFF valve assembly on and off; the fixed mount is fastened on the central portion of the main body in such a way that the water inlet, the water outlet and the valve tube all extend out of the fixed mount, wherein the movable base is pivotably connected to the fixed mount at a position corresponding to the position of the valve tube, so that the movable base is capable of pivoting on the fixed mount; and the timer is mounted in the movable base and provided with a display panel and an operational interface operated by pressing keys, the display panel and the operational interface being exposed on the movable base, the timer being movable together with the movable base when pivoting the movable base with respect to the fixed mount for adjusting a viewing angle for the display panel; characterized in that the fixed mount defines a projecting seat in a position corresponding to the position of the valve tube, wherein the projecting seat is provided with a through hole for passing the valve tube therethrough and a bushing, wherein a plurality of positioning recesses is arranged annularly on the external wall of the bushing, the bushing of the fixed mount being inserted into a corresponding opening defined on the movable base, wherein the movable base further defines a positioning hole, wherein a second spring and a positioning pin to be pushed outwards by the second spring are set in the positioning hole, wherein the positioning hole of the movable base and the bushing of the fixed mount are correspondingly arranged, such that the positioning pin is elastically inserted into a corresponding one of the plurality of positioning recesses, so that after pivoting to a desired viewing angle, the movable base is fixed in its corresponding position through elastic engagement of the positioning pin in the corresponding positioning recess.