The invention discloses an elevator well hole preformed unit. Each preformed unit body is of a reinforced concrete structure, is hollow, is provided with openings in the upper portion and the lower portion, and is prefabricated outside the site in advance; an upper connecting base and a lower connecting base are arranged at the upper opening end and the lower opening end of each preformed unit body correspondingly, an upper butt joint structure is arranged on each upper connecting base, and a lower butt joint structure is arranged on each lower connecting base; and the two preformed unit bodies are subject to rapid alignment installation through the upper butt joint structures and the lower butt joint structures. The elevator well hole preformed unit has the beneficial effects of being simple in structure, safe, reliable and high in on-site installation efficiency.