The utility model provides a protection device for a sand discharging oil well pump. TUBULAR CORE COMPRISING A TUBULAR BODY, a flow divider is positioned and mounted in the body; the internal space ofthe body is divided into an upper space and a lower space by the flow divider; a first channel is formed on the diverter or between the outer side surface of the diverter and the inner wall of the body; the first channel is communicated with the upper space and the lower space; a second channel is formed in the flow divider, at least one through hole is formed in the side wall of the body, the through holes are communicated with the second channel, the second channel penetrates through the upper surface of the flow divider and is communicated with the upper space, and a one-way circulation assembly allowing fluid outside the body to flow into the body through the second channel is arranged in the upper space. By means of the arrangement, the oil well pump can continuously pump oil under the condition that the sand filtering pipe under the pump is blocked, empty pumping of the oil well pump is effectively prevented, and the service life of the oil well pump is guaranteed.