The invention discloses an elevator assembled by utilizing combination type derricks, relating to hoisting equipment. A hoistway wall of the elevator is formed by assembling more than two derricks, wherein each derrick comprises stand columns, a door beam, a front beam, a back beam, a left beam, a right beam, a cage guide rail and a counter-weight guide rail, wherein the four stand columns are distributed at four corners of the derrick, and connection seats are horizontally and fixedly arranged at the top end and the bottom end of each stand column and provided with connection holes; two ends of the door beam, the front beam, the back beam, the left beam and the right beam are transversely and respectively connected with the stand columns; and the cage guide rail and the counter-weight guide rail are respectively installed in the middle parts and the inner sides of the back ends of the left beam and the right beam. Because the derricks can be produced in a standardized way in a factory and assembled on site, the working time limit can be shortened, the cost can be lowered, the manufacturing cost can be reduced, and the installation efficiency and quality can be improved; and because the derricks are matched with an up-down door-opening and closing mechanism, the influence of the installed elevator on ventilation and daylighting of a household can be reduced. The elevator assembled by utilizing the combination type derricks is mainly used for places of low storey dwelling houses, in particular to the old style low storey dwelling houses of less than 9 storeys.