Abstract: A structure improvement for monitor support arm has a main supporting arm and an extending arm. The main supporting arm has an upper cover and a lower cover. The rear end of the upper cover and the lower cover is pivoted on a connecting seat. The connecting seat is pivoted firmly on a fixing seat fixed on a wall. The front ends of the upper cover and the lower cover is pivoted on an engaging seat. Springs using for supporting and adjusting the supporting strength are installed in the upper cover and the lower cover. The extending arm has an upper cover and a lower cover. The rear ends of the upper cover and the lower cover are pivoted on an engaging seat. The front ends of the upper cover and the lower cover are pivoted on a connecting seat. The front end of the connecting seat is installed on monitor fixing seat for suspending fixedly a monitor by using a shaft. A spring for supporting and adjusting is installed between the upper cover and the lower cover.