The invention discloses a seabed tube section circulation loading monitoring and testing system which comprises a testing tank, a power transmission device, a data acquisition device, a vertical displacement device and experiment accessories, wherein the experiment accessories comprise a plurality of steel tube sections of different diameters and iron sand; one of the steel tube sections is used as a tested tube section which is buried in soil or is directly placed inside the testing tank; the tested tube section is arranged along the width direction of the testing tank; the vertical displacement device is arranged above the tested tube section and is connected with the power transmission device; the data acquisition system comprises a pull pressure sensor, a depth sensor or a dial indicator, a static strain acquirer, a computer and a camera. By adopting the seabed tube section circulation loading monitoring and testing system, the mutual relationship between the tube movement track and the constraint force of a foundation soil body can be simulated when a seabed tube makes horizontal large-displacement reciprocation movement.