PURPOSE: To provide a pipe coupling device which can be separated and fitted automatically without using a manual work by a worker.

CONSTITUTION: The first piping block held slidable vertically on a moving plate 1 moving vertically through a guide rod 3, and the second piping block 31 fixed on the upper side of an upper platen 30, are provided up and down, and by fitting a socket 7 to be the female type member at the first piping block side, and a plug 34 to be the male type member at the second piping block side, passages 10 and 37 of pressured fluid in the first and the second piping blocks 2 and 31 are communicated each other. Furthermore, a projection 33 provided at the upper side of the second piping block 31, and a hole 6 formed at the lower surface side of the first piping block 2 are made fittable each other, and the fitting of the projection 33 and the hole 6 is locked or the locking is released by a locking means, in this pipe coupling device.