The utility model provides a double-tube inlet/outlet material distribution device of a stand-alone double-barrel hydraulic testing machine. The double-tube inlet/outlet material distribution device comprises a feeding plate, a base and a discharging plate, wherein a lifting mechanism and a material distributing plate are arranged on the base; the lifting mechanism drives a material receiving frame to move up and down in the vertical direction; the top surfaces of the material receiving frame and the material distributing plate are inclined planes, and the inclined directions of the two inclined planes are opposite; a third blocking head is arranged on the lower side of the top surface of the material receiving frame; a second blocking head is arranged on the higher side of the top surface of the material distributing plate; the top surfaces of the feeding plate and the discharging plate are inclined planes, and the inclined directions of the two inclined planes are the same; a first blocking head is arranged on the lower side of the top surface of the feeding plate; during use, the material distributing plate is positioned between the feeding plate and the discharging plate, so that the higher side of the top surface of the material receiving frame faces the feeding plate; a gap is reserved between the material distributing plate and the feeding plate, as well as between the material distributing plate and the discharging plate; the lower side of the top surface of the feeding plate faces the material distributing plate. The device is suitable for hydrostatic tests of steel pipes in various calibers, and can meet the inlet/outlet material requirements of the stand-alone double-barrel hydraulic testing machine.