The invention discloses a self-traveling vehicle for detecting and spraying an anti-corrosion layer in a pipeline. The self-traveling vehicle comprises a frame, driving wheels, brake blocks, an electric spark leak detector and a spraying trolley, wherein each driving wheel is arranged at one end of each driving wheel supporting arm through a pin shaft; the middle parts of the driving wheel supporting arms are arranged on a first rotating shaft in a rotatable manner; the other end of each driving wheel supporting arm is connected with a sliding sleeve through a hinge; the driving wheels are connected with a driving device; a brake block is arranged at one end of each brake block supporting arm through a pin shaft; the middle parts of the brake block supporting arms are arranged on a second rotating shaft in a rotatable manner; the other end of each brake block supporting arm is connected with the sliding sleeve through a hinge; the sliding sleeve is sleeved on a hollow shaft in a sliding manner; the hollow shaft is fixedly arranged on the frame; an electric push rod is positioned in the hollow shaft; the movable end of the electric push rod is connected with the sliding sleeve; an electric spark coil is arranged on the frame; an annular guide rail is arranged on one side of the frame; and the spraying trolley is arranged on the annular guide rail in a sliding manner. The self-traveling vehicle has functions of detecting and recovering the anti-corrosion layer in the pipeline.