To provide a pipe inner surface treatment method for removing the adherend on the inner surface of a pipe to be treated, more detailed, removing rust generated on the inner surface of the piping and tube used, for example, in various plants such as a power plant, a petroleum petrifaction plant or the like and machine equipment or the like or the adherend such as fur, a calcium component, an oil component or the like adhering to the inner surface of the piping and the tube.

In the pipe inner surface treatment method for spraying a sodium bicarbonate jet material on the scaled inner surface of a pipe, a jet nozzle equipped with a hose for feeding the jet material into the pipe under pressure is inserted into the pipe and allowed to advance and retreat while uniformly ejecting the jet material toward the inner surface of the pipe from the leading end of the nozzle.