The invention relates to a corrosion monitoring probe (by reflectometry measurement. The corrosion monitoring probe (10) comprises a probe body (110) intended to be connected to a reflectometry measurement unit (20), to the at least a first longitudinal metal waveguide (120). The first waveguide (120) has at least a first and a second longitudinal portion (121, 122) which follow one another along the probe body (110) and being dimensioned to have a corrodable thickness different from each other, the first longitudinal portion (121) being the portion furthest from the probe body (110) among the first and second longitudinal portions (121, 122) and having a corrodable thickness less than that of the second longitudinal portion (122).
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