Assembled door frame with easiness in construction

The utility model relates to an assembled door frame with easiness in construction. The assembled door comprises a bottom component, a first middle component, a second middle component, a fixing component and a top component, wherein a first joint slot is arranged at the central region at the upper part of the bottom component in the length direction; the bottom component is mounted along the circumference in a wall going-in/out space part; the first and the second middle components comprise an upper cover part and a side cover part which wrap the partial upper part and the partial side part of an adjacent bottom component respectively, so as to form an accommodating space part at the upper part of the first joint slot; a mounting plug-in unit type first joint part and a mounting plug-in unit type second joint part are arranged at the upper part and the lower part of the fixing component respectively; the first joint part is inserted into the first joint slot of the bottom component; the top component compris