The invention discloses a machine-roomless elevator which comprises a car, a tractor, a counterweight frame and a flexible traction piece, wherein the car and the counterweight frame are suspended in a well hole, a traction wheel connected with a driving mechanism is arranged on the tractor, a guide wheel is arranged on the counterweight frame, at least one car bottom diversion sheave is arrangedat the bottom of the car, the tractor is fixedly mounted at the bottom of the car, a top diversion sheave is further arranged at the top of the well hole, one end of the flexible traction piece is connected at the top of the well hole, and the other end of the flexible traction piece bypasses the guide wheel, then upwards bypasses the top diversion sheave, further downwards bypasses the traction wheel along one side of the car, bypasses the car bottom diversion sheave and is then upwards connected at the top of the well hole along the other side of the car; and the wrap angle of the flexible traction piece on the traction wheel is larger than 90 degrees. The elevator is convenient to mount, the height or the depth of a top layer or a bottom layer of the well hole does not need to be increased, and the construction cost is saved; and few pre-buried pieces are arranged in the well hole, and the construction of the well hole is more convenient.