One-behavior type prefabricated manhole

The present invention relates to a one behavior type prefabricated manhole, of which upper and lower manhole bodies can be easily engaged by one touch, and a connecting portion between the upper and lower manhole bodies is structurally stable. The manhole includes: an upper manhole body (100) buried in the ground and having an inner space to collect waste water; a lower manhole body (200) engaged to the upper manhole body in a communication manner and having an inner space to collect waste water, and a receiving groove (210) with a receiving space being opened upwardly; a male engaging member (300) protruding from the upper or lower manhole body; a female engaging member (400) receiving the male engaging member in a state of being inserted in the receiving groove of the lower manhole body; and a female fixing part (500) fitted into the receiving groove (210) of the lower manhole body to lock the female engaging member (400).