I am a Green Card holder since 07/28/2019 and I am outside USA now , will I get effected or ban from entry because of President recent executive order to ban the immigration for 60 days?
According to the text of the proclamation suspending entry, it does not apply to permanent residents (i.e. green card holders), so it should not affect your return to the US. See section 2(b)(1) of the proclamation:
(b) The suspension and limitation on entry pursuant to section 1 of this proclamation shall not apply to:
(i) any lawful permanent resident of the United States;