The invention discloses an online testing system for the erosion resistant function of living creature body surfaces. A computer is connected with a high-speed camera; the high-speed camera is installed on a high-camera camera support and an adjusting screw; a controllable funnel is fixed to the top end of a porous support; an object board is fixed to the porous support through a locating nut and located under the controllable funnel; the porous support is fixedly arranged on a sand collection bucket; the sand collection bucket is fixed to a machine frame; a sand storage chamber is arranged below the sand collection bucket; the lower end of a conveying auger is arranged inside the sand storage chamber; the upper end of the conveying auger is bent; an upper port is formed over the controllable funnel. The online testing system for the erosion resistant function of the living creature body surfaces is simple in structure and convenient to operate, can test the erosion resistance of various living creature body surfaces or non-biological materials, and can provide test mean support for selecting erosion-resisting materials, improving the erosion resistance of the materials and studying the erosion resistance mechanism of the materials.