The invention discloses a novel solar energy water heater heat collection device comprising a reflecting mirror and a spherical transparent heat absorber. The reflecting mirror is a half-closed large spherical hollow sphere. A hollow cone penetrates through the lower end of the reflecting mirror, and the reflecting mirror is supported by the cone to be fixedly installed on a rotary table. A circular notch is obliquely formed at the upper left end of the reflecting mirror. A trapezoidal Fresnel lens is inlaid in the outer surface of the cone. The spherical heat absorber is further fixedly installed on the top of the cone and inlaid inside the trapezoidal Fresnel lens. An arc-shaped pipeline is arranged on the outer surface of the spherical heat absorber. The lower end of the arc-shaped pipeline penetrates through the inner wall of the cone to be connected with a connecting pipeline arranged at the left end of the cone. Solar energy and heat of other connectors can be effectively absorbed, the utilization rate of the solar energy is increased, a heat storage box is used for maintaining the temperature inside the heat absorber, and practicability is high.