only one transversal segment floating body upon connection with the reduction gearbox below it the power device 9 is uprightly connected to the longitudinal floating bodies 2 by a mounting bracket 33 the waterproof hood 28 covers the power device the reduction gearbox drive shaft 10 is connected with impellers 8 on the right and left side both the end part of the transversal floating body 1 and main longitudinal floating body 2 set a rod inserting hole for the floating bodies location 14 which is used to put a location rod for preventing the oxygen increasing machine from moving in the water while it works embodiment 2 as shown in fig2 a combined waterwheel oxygen increasing machine of another kind of u201c t u201d shaped floating bodies a main longitudinal floating body 2 is vertically connected to the middle part of the transversal floating bodies 1 assembled by only one transversal segment floating body on the main longitudinal floating body 2 a water cooled engine 27 sets uprightly below the water cooled engine 27 a reduction gearbox is connected on both the right and left sides of drive shaft 10 of said gearbox connect an overlapping impeller 8 respectively which is formed firstly by several single impeller bodies 7 with a plural number of blades 6 connected in a series and then by an end cover 19 installed on both ends the blades 6 of the overlapping impellers appear to be spiral shaped along the direction of the drive shaft 10 thus stressed pressure of impellers is more uniform while water is stirred the splash raised by the blades 6 close to the power device.