Unmanned ocean detector, as an important tool for the development of marine resources, generally lacks efficient and reliable power supply. Wave energy is the most widely distributed renewable ocean energy, and it is expected to be the ideal energy source for the detectors. A novel wave energy point absorber was presented based on the counterrotating selfadaptable mechanism. The new point absorber can achieve the selfadaptable deflection of the blades to the water flow and automatically balance the overall torque of the absorber. A comprehensive numerical analysis and experimental verification of the new point absorber were conducted, and the influence rules of structure and system parameters on the power and efficiency characteristics were obtained. Through numerical analysis, it was found that the power and efficiency characteristics of the point absorber were greatly affected by the inclination angle of the blade, the relative flow velocity, the rotational speed and the interaction between the upper and lower absorbers. The highvalue range of power of the absorber was in the high relative velocity range, and the corresponding optimal blade inclination angle was 30°~45°; the highvalue range of efficiency was in the low relative velocity range, and the corresponding optimal blade inclination angle was 20°~35°. A rotational speed of 50~90r/min was suitable for most typical sea conditions. Large blade inclination angle can weaken the interaction between the upper and lower absorbers, and small blade inclination angle can improve the performance of the singlelayer absorber. Selecting suitable structure and system parameters can help further optimize the performance characteristics of the novel point absorber. In addition, validation experiments in test pool and wave tank were conducted respectively to verify the accuracy of numerical analysis and the feasibility of the novel point absorber.