The invention relates to the technical field of conveyors, in particular to a portable ultra-long tubular belt conveyor which is used for solving the problem that in the prior art, the material conveying distance of a conveyor is not long enough. The portable ultra-long tubular belt conveyor comprises a first vertical frame, a second vertical frame, a transverse frame, a driving shaft, a driven shaft, a driving roller, a driven roller and a conveying rubber belt; a left rolling mechanism is installed at the inner side of the first vertical frame, a right rolling mechanism is installed at the inner side of the second vertical frame, and a lower rolling mechanism is installed on the top face of the transverse frame; and a conveying cavity is reserved among the left rolling mechanism, the right rolling mechanism and the lower rolling mechanism, and the conveying rubber belt penetrates through the conveying cavity. According to the portable ultra-long tubular belt conveyor, the conveying rubber belt makes contact with the left rolling mechanism, the right rolling mechanism and the lower rolling mechanism in the material conveying process, in this way, small rolling friction force is mainly generated in the process that the conveying rubber belt operates on the transverse frame, and the smaller the friction force of the conveying rubber belt is, the longer the rubber belt can be conveyed, so that the conveyor can convey materials for a longer distance.