The utility model discloses a polished rod corrosion prevention device belongs to oil development accessory technical field. The device includes: a cap and a tapping section of thick bamboo are pressed to the packing, the packing presses the cap sleeve to connect in the polished rod outside, the top of cap setting at packing gland is pressed to the packing, the lower extreme inboard of cap and the upper end outside static connection of packing box are pressed to the packing, the tapping barrel casing connects the polished rod outside, the lower extreme and the setting of a tapping section of thick bamboo are in the top in close contact with of the boss of cap upper end is pressed to the packing, the lower extreme of a tapping section of thick bamboo inboard with the upper end outside static connection of cap is pressed to the packing, the polished rod with packing pressure cap a tapping section of thick bamboo reaches packing in the packing box is formed with the annular space. The utility model provides a present polished rod corrosion prevention device more complicated to the operation that the polished rod carries out preserved handle, and the higher problem of cost has realized the operation of simplification preserved handle, reduce cost's effect for carry out preserved handle to the polished rod.