Capillary tube inner wall cleaning device

The utility model provides a capillary tube inner wall cleaning device which comprises a cleaning agent tank. The cleaning agent tank is provided with a liquid outlet tube, a high-pressure air inlet tube, a cleaning agent filling funnel and an air exhausting tube. The liquid outlet tube is inserted into a tank body. The high-pressure air inlet tube is inserted into the tank body. The cleaning agent filling funnel and the air exhausting tube are communicated with the interior of the tank body through corresponding valves. A first clamping valve is arranged at the tail end of the liquid outlet tube. A second clamping valve is arranged at one end of a liquid return tube, and the other end of the liquid return tube is connected with a recycling container. A to-be-cleaned capillary tube is connected between the first clamping valve and the second clamping valve to form a cleaning pipeline. The high-pressure air inlet tube is communicated with a high-pressure air main tube. A third clamping valve is arranged at the