The invention is a protective arm protective device, which is used for striking baseball, and comprises a shock absorption cushion, a front protective cover, a back protective cover and a plurality of protective shells.The shock absorbing cushion is of long plate type, with front and rear fixing belts at the bottom and at least one fixed ring at the front.The front protective cover is arranged on the shock absorption cushion, at the front end of the shock absorption cushion； the rear protective cover is arranged on the shock absorption cushion, and at the rear side of the front protective cover； the plurality of protective covers are respectively arranged on the outside of the front protective cover and the rear protective cover, and the plurality of protective covers can be expanded relative to the front protective cover and the rear protective cover.In this way, the forearm of the batter can be protected and the damage to the forearm caused by the touch ball can be reduced.本創作為一種防護手臂護具，供打擊棒球時使用，包含：一吸震軟墊、一前防護罩、一後防護罩以及複數防護殼。吸震軟墊係呈長板型，底部間隔設有前固定帶及後固定帶，吸震軟墊的前端設有至少一固定指環。前防護罩設於吸震軟墊上，位於吸震軟墊前端；後防護罩設於吸震軟墊上，且位於前防護罩的後側；複數防護殼分別設置於前防護罩及後防護罩的外側，複數防護殼可相對前防護罩及後防護罩展開。藉此，以保護打擊者的前臂，減少被觸身球擊中所造成前臂的傷害。
