The utility model discloses a decollator, which aims at solving the problems that the liquid phase distributes higher peak value along the radial direction, the spraying area is smaller, etc. existed in the existing decollator respectively. In the decollator, a truncated cone surface-shaped upper baffle plate (1) is arranged under a cylinder body (5), a truncated cone surface-shaped middle baffle plate (2) is arranged under the upper baffle plate, and a cone surface-shaped lower baffle plate (3) is arranged under the middle baffle plate. Two to ten loops of openings (9) are formed on the upper baffle plate around an axial lead; the same openings are opened on the middle baffle plate corresponding to the positions of the openings on the upper baffle plate, and another 1 to 3 loops of the openings are opened on the middle baffle plate towards the top direction around the axial lead; the same openings are opened on the lower baffle plate corresponding to the positions of the openings on the middle baffle plate, and another 1 to 5 loops of the openings are opened on the lower baffle plate towards the cone apex direction around the axial lead. The decollator can be used in a reactor of a fixed bed catalytic reaction device in the petroleum refining and petrochemical industries, such as in the reactor of a hydrogenation (hydrocracking and hydrofining) device.