Novel concentric pipe sand washing tool

The utility model relates to a novel concentric pipe sand washing tool which is characterized in that an external thread connecting section and a connector center pipe are arranged at one end, connected with a concentric continuous oil pipe, of a flow channel conversion connector, and the external thread connecting section is connected with an outer pipe of the concentric continuous oil pipe in an annular pressing mode through an external groove connector; the connector center pipe is connected with an inner pipe of the concentric continuous oil pipe in an annular pressing mode. The double-flow-channel short section is provided with a short section center flow channel and a plurality of annular outer flow channels, and a plurality of communicating flow channels communicating with the annular outer flow channels are arranged on the radial circumference of the lower portion of the short section center flow channel. A flow control nozzle is mounted on the communicating flow channel; the lower portion of the doub