The utility model discloses a circulating perfusion measuring tank. The circulating perfusion measuring tank comprises a tank body, wherein the upper end of the tank body is open, the tank body is divided into a perfusion return fluid measuring region, a well killing fluid storage region and a well washing circulating sand setting region, the well killing fluid storage region is communicated with the upper portion of the well washing circulating sand setting region, the well killing fluid storage region is communicated with a wellbore opening sequentially through a water feeding pipe, pumping-in equipment and a well inlet pipeline, the water feeding pipe is provided with a first butterfly valve, the well washing circulating sand setting region is communicated with the wellbore opening through a diversion pipe which is provided with a second butterfly valve, the perfusion return fluid measuring region is communicated with the well killing fluid storage region through an input pipe which is provided with a third butterfly valve, the perfusion return fluid measuring region is communicated with the wellbore opening through a first pipeline, a well inlet square pipe and a second pipeline, the first pipeline is provided with a fourth butterfly valve and an electric submersible pump, the wellbore opening is communicated with the perfusion return fluid measuring region through a return pipe and a well outlet square pipe, and the return pipe is provided with a fifth butterfly valve. The circulating perfusion measuring tank achieves the three functions of circulating well washing, drilling-down return fluid recovering measuring and pulling-out wellbore perfusion measuring.