The invention relates to an assembled building door and window convenient to transport. An installing frame and a door and window outer frame are included and embedded and poured in a wall. The installing frame is provided with an installing part. The installing part and the installing frame are integrally formed. The door and window outer frame is provided with a connecting sheet. The connectingsheet and the door and window outer frame are integrally formed. The connecting sheet and the installing part are fixedly connected through a fixing piece. The installing frame is embedded in the wall, during transportation, friction or collisions between the installing frame and other walls hardly happen, and the situation of installing frame damage due to collisions is effectively avoided. The door and window outer frame can be additionally transported and is made of aluminum profile materials, the mass is small, the occupied space is small relative to the occupied space of the wall, scratching or damage is not likely to happen, and transportation is convenient.