A telescopic and portable fixed inserted-rod comprises a main rod, a tail rod and a thimble, one end of the tail rod is sleeved with the main rod and can slide along the main rod which is in a hollow cylinder shape, and the cylindrical surface of the main rod is provided with a window communicated with the cavity inside the main rod; a lock catch is arranged inside the main rod and provided with a groove, and the position of the groove corresponds to that of the window; the thimble is arranged inside the main rod and on the upper portion of the lock catch, and the thimble is connected with the lock catch through a spring; a U-shaped steel wire is arranged inside the lock catch, at least one part of one side of the U-shaped steel wire penetrates through the groove, and at least one part of the other side of the U-shaped steel wire is inserted in the thimble. The telescopic and portable fixed inserted-rod is convenient to use repeatedly, beneficial to standardization management and capable of being widely applied to transformer substations in a company scope.