The invention discloses a submarine cable armoring wire crevice corrosion test device and an evaluation method. At present, a device and method capable of reasonably reflecting the crevice corrosion risk of the metal armoring wires of submarine cables and providing quantitative evaluation are urgently needed. The device of the invention comprises a seawater medium experiment box and a crevice corrosion clamp; the crevice corrosion clamp is arranged in the seawater medium experiment box; the seawater medium experiment box is used as a container for containing a solution to simulate a seawater corrosion environment; the crevice corrosion clamp is used as a main body for wire crevice corrosion simulation and is used for clamping wires and adjusting an artificial crevice between two wires; thecrevice corrosion clamp is a supporting seat shaped like a Chinese character ''ao''; and two supporting limiting holes are formed in vertical plates at two sides of the crevice corrosion clamp on a coaxial straight line respectively. According to the device of the invention, the crevice corrosion clamp can be adjusted, so that the size of the crevice can be adjusted; tensile stress is applied toa sample; and therefore, the working condition of the armoring wires can be simulated.