A multibubble injection type Dissolved Air Flotation, DAF, water treatment apparatus for removing suspended particles contained in feed water to be treated, the DAF water treatment apparatus comprising: a mixing and coagulation basin configured to stir a coagulant and feed water when the coagulant is injected into the feed water so as to form and grow up flocs through coagulation of suspended particles; a flotation basin configured to inject micro bubbles and make the micro bubbles contact with the floes contained in the feed water to form a combined body, raise the combined body to the surface of water and remove the combined body; and micro bubble distributing means having one or more nozzles configured to receive saturated water, in which air is saturated, through a saturated water supply pipe in order to spray the saturated water into the flotation basin, wherein the flotation basin is divided into a contact zone, in which the injected micro bubbles and the flocs come into contact with each other, and a separation zone, which removes the combined body rising to the surface of water and discharges treated water to a rear end, by a partition upwardly extending from a bottom surface of the flotation basin, wherein the micro bubbles are injected through the micro bubble distributing means so that the micro bubbles are supplied to both a lower part of the contact zone and a lower part of the separation zone, and wherein the mixing and coagulation basin comprises: a first mixing and coagulation part which is filled with first turbulence derivatives to generate high speed turbulence to first form flocs in the raw water; and a second mixing and coagulation part which is filled with second turbulence derivatives to generate turbulence slower than the turbulence of the first mixing and coagulation part so as to grow up the flocs in the raw water passing the first mixing and coagulation part; wherein the first mixing and coagulation part is disposed above the second mixing and coagulation part so that the raw water put in the first mixing and coagulation part passes the second mixing and coagulation part by gravity; and wherein the first turbulence derivatives are mesh-type materials which are stacked manifold or plurality of fiber aggregates configured to be tangled together, and the second turbulence derivatives are a plurality of pall ring type materials. a mixing and coagulation basin configured to stir a coagulant and feed water when the coagulant is injected into the feed water so as to form and grow up flocs through coagulation of suspended particles; a flotation basin configured to inject micro bubbles and make the micro bubbles contact with the floes contained in the feed water to form a combined body, raise the combined body to the surface of water and remove the combined body; and micro bubble distributing means having one or more nozzles configured to receive saturated water, in which air is saturated, through a saturated water supply pipe in order to spray the saturated water into the flotation basin, wherein the flotation basin is divided into a contact zone, in which the injected micro bubbles and the flocs come into contact with each other, and a separation zone, which removes the combined body rising to the surface of water and discharges treated water to a rear end, by a partition upwardly extending from a bottom surface of the flotation basin, wherein the micro bubbles are injected through the micro bubble distributing means so that the micro bubbles are supplied to both a lower part of the contact zone and a lower part of the separation zone, and wherein the mixing and coagulation basin comprises: a first mixing and coagulation part which is filled with first turbulence derivatives to generate high speed turbulence to first form flocs in the raw water; and a second mixing and coagulation part which is filled with second turbulence derivatives to generate turbulence slower than the turbulence of the first mixing and coagulation part so as to grow up the flocs in the raw water passing the first mixing and coagulation part; wherein the first mixing and coagulation part is disposed above the second mixing and coagulation part so that the raw water put in the first mixing and coagulation part passes the second mixing and coagulation part by gravity; and a first mixing and coagulation part which is filled with first turbulence derivatives to generate high speed turbulence to first form flocs in the raw water; and a second mixing and coagulation part which is filled with second turbulence derivatives to generate turbulence slower than the turbulence of the first mixing and coagulation part so as to grow up the flocs in the raw water passing the first mixing and coagulation part; wherein the first mixing and coagulation part is disposed above the second mixing and coagulation part so that the raw water put in the first mixing and coagulation part passes the second mixing and coagulation part by gravity; and