Water-resistance rowing exercise machine

A water-resistance rowing exercise machine, comprising:

• a bracket, a water tank fixed on the bracket, a linkage mechanism and a rotation angle adjustment mechanism, wherein a first impeller and a second impeller are disposed inside the water tank;
• the linkage mechanism comprises a rotation shaft assembly partially inserted into the water tank and connecting the first impeller and the second impeller, a pulley fixed on a portion of the rotation shaft assembly located outside the water tank, a conveyer belt capable of being wound around the pulley, a handle connected to an end of the conveyor belt away from the pulley, and an elastic rope connected to the bracket and capable of being wound on the pulley;
• the first impeller comprises a first plate portion and a number of first blades distributed on the periphery of the first plate portion;
• the second impeller comprises a second plate portion and a number of second blades distributed on the periphery of the second plate portion;
• and
• the rotation angle adjustment mechanism is configured to adjust a relative rotation angle between the first impeller and the second impeller so as to enable the first blades and the second blades to approach toward or depart from each other.