The invention discloses a portable switch cabinet handcart rail. The portable switch cabinet handcart rail comprises longitudinal rails, wherein the longitudinal rails are arranged in parallel in a left-right way and are fixedly connected by a width adjustment device, clamping arms are fixedly arranged at a front end of the width adjustment device and extend towards a switch cabinet, clamping claws are fixedly arranged at the bottoms of the clamping arms and are matched with clamping groove hooks at the bottom of the switch cabinet, limiting plates are arranged at two sides of at least one longitudinal rail and upwards extend, two guide plates are fixedly arranged at the upper end of the limiting plate and extend opposite to each other, a gap is formed between the two guide plates and is matched with switch cabinet handcart wheels, and an inlet end of each gap is arranged to be a bell mouth with a wide external end and a narrow internal end. The portable switch cabinet handcart rail has the advantages that the portable switch cabinet handcart rail is reliably connected with a switch cabinet and is not liable to swing, a handcar can be rapidly and accurately aligned to an entrance of the switch cabinet, the alignment ratio is improved, the handcar is prevented from being pulled and pushed repeatedly, different switch cabinet widths can be adapted by adjusting the width of the handcart rail, the handcar can be successfully pushed to the switch cabinet in one time, switching operation can be completed by a person, and the operation efficiency can be greatly improved; and moreover, the portable switch cabinet handcart rail is small in size, is convenient to carry and occupies small space for placing.