An adjusting base (100, 200, 300) for door closer, comprising: a fixing member (110, 310) configured to be fixed to a surface, wherein an upper surface of the fixing member (110, 310) is arranged with at least one protrusion (114, 116, 314, 316); an adjusting member (120, 320) arranged on the upper surface of the fixing member (110, 310) in an adjustable manner, and configured to be connected to a door closer, wherein the adjusting member (120, 320) is formed with at least one adjusting hole (124, 126, 324, 326) for receiving the at least one protrusion (114, 116, 314, 316); and at least one adjusting unit (130, 140, 330, 340) movably arranged on the adjusting member (120, 320) and configured to abut against the at least one protrusion (114, 116, 314, 316) to adjust a relative position between the adjusting member (120, 320) and the fixing member (110, 310); characterized in that the at least one protrusion (114, 116, 314, 316) comprises a first protrusion (114, 314) and a second protrusion (116, 316), the at least one adjusting hole (124, 126, 324, 326) comprises a first adjusting hole (124, 324) configured to receive the first protrusion (114, 314) and a second adjusting hole (126, 326) configured to receive the second protrusion (116, 316), and wherein the at least one adjusting unit (130, 140, 330, 340) comprises: a plurality of first adjusting units (130, 330) movably arranged on the adjusting member (120, 320) and configured to abut against the first protrusion (114, 314) to adjust a relative position between the first protrusion (114, 314) and the first adjusting hole (124, 324); and a plurality of second adjusting units (140, 340) movably arranged on the adjusting member (120, 320) and configured to abut against the second protrusion (116, 316) to adjust a relative position between the second protrusion (116, 316) and the second adjusting hole (126, 326). a fixing member (110, 310) configured to be fixed to a surface, wherein an upper surface of the fixing member (110, 310) is arranged with at least one protrusion (114, 116, 314, 316); an adjusting member (120, 320) arranged on the upper surface of the fixing member (110, 310) in an adjustable manner, and configured to be connected to a door closer, wherein the adjusting member (120, 320) is formed with at least one adjusting hole (124, 126, 324, 326) for receiving the at least one protrusion (114, 116, 314, 316); and at least one adjusting unit (130, 140, 330, 340) movably arranged on the adjusting member (120, 320) and configured to abut against the at least one protrusion (114, 116, 314, 316) to adjust a relative position between the adjusting member (120, 320) and the fixing member (110, 310); characterized in that the at least one protrusion (114, 116, 314, 316) comprises a first protrusion (114, 314) and a second protrusion (116, 316), the at least one adjusting hole (124, 126, 324, 326) comprises a first adjusting hole (124, 324) configured to receive the first protrusion (114, 314) and a second adjusting hole (126, 326) configured to receive the second protrusion (116, 316), and wherein the at least one adjusting unit (130, 140, 330, 340) comprises: a plurality of first adjusting units (130, 330) movably arranged on the adjusting member (120, 320) and configured to abut against the first protrusion (114, 314) to adjust a relative position between the first protrusion (114, 314) and the first adjusting hole (124, 324); and a plurality of second adjusting units (140, 340) movably arranged on the adjusting member (120, 320) and configured to abut against the second protrusion (116, 316) to adjust a relative position between the second protrusion (116, 316) and the second adjusting hole (126, 326). a plurality of first adjusting units (130, 330) movably arranged on the adjusting member (120, 320) and configured to abut against the first protrusion (114, 314) to adjust a relative position between the first protrusion (114, 314) and the first adjusting hole (124, 324); and a plurality of second adjusting units (140, 340) movably arranged on the adjusting member (120, 320) and configured to abut against the second protrusion (116, 316) to adjust a relative position between the second protrusion (116, 316) and the second adjusting hole (126, 326).