A door closer device, comprising: a door closer including a rotating shaft ; and an adjustment mechanism including a base , an adjusting plate and at least one fixing element , the base having an accommodation part and the rotating shaft of the door closer being coupled to an axial bore of the adjusting plate ; characterized in that the base includes at least one adjusting bore , the adjusting bore of the base includes a first limiting end and a second limiting end , and a first moving path (L1) is defined between the first limiting end and the second limiting end , the adjusting plate is stacked with the base and includes an axial bore aligned with the accommodation part and at least one second adjusting bore corresponding with the adjusting bore of the base , the second adjusting bore of the adjusting plate includes a third limiting end and a fourth limiting end , and a second moving path (L2) is defined between the third limiting end and the fourth limiting end , the fixing element is disposed in the adjusting bores (112/122) of the adjusting plate and the base and able to move along the first moving path (L1) or the second moving path (L2) to fix the adjusting plate on the base ; wherein the first moving path (L1) and the second moving path (L2) are perpendicular to one another; and wherein the adjusting plate further includes a fixing base , the fixing base protrudes from a surface of the adjusting plate facing toward the base and is disposed in the accommodation part , there is a space (S) between an internal side surface of the accommodation part and an external side surface of the fixing base . a door closer including a rotating shaft ; and an adjustment mechanism including a base , an adjusting plate and at least one fixing element , the base having an accommodation part and the rotating shaft of the door closer being coupled to an axial bore of the adjusting plate ; characterized in that the base includes at least one adjusting bore , the adjusting bore of the base includes a first limiting end and a second limiting end , and a first moving path (L1) is defined between the first limiting end and the second limiting end , the adjusting plate is stacked with the base and includes an axial bore aligned with the accommodation part and at least one second adjusting bore corresponding with the adjusting bore of the base , the second adjusting bore of the adjusting plate includes a third limiting end and a fourth limiting end , and a second moving path (L2) is defined between the third limiting end and the fourth limiting end , the fixing element is disposed in the adjusting bores (112/122) of the adjusting plate and the base and able to move along the first moving path (L1) or the second moving path (L2) to fix the adjusting plate on the base ; wherein the first moving path (L1) and the second moving path (L2) are perpendicular to one another; and wherein the adjusting plate further includes a fixing base , the fixing base protrudes from a surface of the adjusting plate facing toward the base and is disposed in the accommodation part , there is a space (S) between an internal side surface of the accommodation part and an external side surface of the fixing base . <EOS>