Suction device for a submersible wastewater pump for draining wastewater permeated with thick matter portions and fiber portions from origin and collection tanks via an entire suction channel, wherein the thick matter portions and fiber portions, after being broken up and comminuted by means of a cutting unit into small-scale volume fractions can, together with the wastewater, be discharged from the pump housing in lifting fluid flow directions, through suction channel bores and sucked in by the pump drive, wherein the suction device consists of the entire suction channel, the cutting unit and a suction flange having the suction channel bores, wherein the cutting unit consists of • a cutting rotor, which is fitted with cutting blades that are actuated planarly and circumferentially by a cutting rotor drive shaft with the rotational movement of the pump drive, and • a cutting plate which is used as a carrier plate for cutting blades which are directed in the opposite direction to the cutting blades on the cutting rotor and which are arranged on one side and in a wedge-like manner in oblique slot-shaped cutting and passage openings, wherein the cutting and passage openings are formed in a radial and star-like arrangement to one another, wherein the fluid medium sucked in from a suction side via the entire suction channel in the fluid flow direction meets the cutting and passage openings on the cutting plate, wherein the suction flange is fixedly arranged between the cutting unit and the pump housing by means of fastening elements in such a way that the cutting plate is used as a cover plate for the suction flange, that the cutting and passage openings are designed as suction and entry points for the fluid medium in the suction flange and in the pump housing, that the fluid medium flows directly out of the cutting and passage openings into the suction channel bores of the suction flange, and that the fluid medium, divided into at least six parallel suction channel bores, is conveyed therein as separate partial volume quantities, and wherein the cross-sectional volume and quantity volume of all suction channel bores in the suction flange is dimensioned smaller than the cross-sectional volume and quantity volume of the entire suction channel on the suction side of the pump housing in order to increase the flow rate and thus improve the cutting quality. • a cutting rotor, which is fitted with cutting blades that are actuated planarly and circumferentially by a cutting rotor drive shaft with the rotational movement of the pump drive, and • a cutting plate which is used as a carrier plate for cutting blades which are directed in the opposite direction to the cutting blades on the cutting rotor and which are arranged on one side and in a wedge-like manner in oblique slot-shaped cutting and passage openings, wherein the cutting and passage openings are formed in a radial and star-like arrangement to one another, wherein the fluid medium sucked in from a suction side via the entire suction channel in the fluid flow direction meets the cutting and passage openings on the cutting plate, wherein the suction flange is fixedly arranged between the cutting unit and the pump housing by means of fastening elements in such a way that the cutting plate is used as a cover plate for the suction flange, that the cutting and passage openings are designed as suction and entry points for the fluid medium in the suction flange and in the pump housing, that the fluid medium flows directly out of the cutting and passage openings into the suction channel bores of the suction flange, and that the fluid medium, divided into at least six parallel suction channel bores, is conveyed therein as separate partial volume quantities, and wherein the cross-sectional volume and quantity volume of all suction channel bores in the suction flange is dimensioned smaller than the cross-sectional volume and quantity volume of the entire suction channel on the suction side of the pump housing in order to increase the flow rate and thus improve the cutting quality.