The invention relates to a rapid-installation flexible graphite earth electrode. The rapid-installation flexible graphite earth electrode comprises a support mandril, an earth-in head, a flexible graphite braided cover, and a detachable power head, wherein the flexible graphite braided cover is sleeved on the external of the support mandril, the earth-in head is arranged at the head part of the support mandril; the earth-in head comprises a conical point and a round tube conveniently to couple with the support mandril head in a sleeving way; the end part of the flexible graphite braided cover is clamped between the round tube and the support mandril; and the detachable power head is arranged at the tail part of the support mandril. An operation of digging up a trench in the ground is unnecessary in the installation, and a sledge hammer can be used for smashing into the soil, the construction amount is small, the construction cost is low, the efficiency is high, the installation is convenient, the floor space is small, and the transportation is convenient; the sledge hammer can smash into the soil so that the affinity with the soil is high, the wettability is good, the current diffusing effect is strong, the earthing effect is excellent, the earth electrode can be used in the place at which the ground cannot be broken and dug, and the application prospect is good.