Portable foundation bolt rust prevention device

The utility model is mainly applied to the technical field of tower crane standard knot foundation bolt rust prevention, and particularly relates to a portable foundation bolt rust prevention device which comprises a foundation bolt, the foundation bolt penetrates through a supporting leg base plate, the portion, penetrating out of the supporting leg base plate, of the foundation bolt is fastened through a fixing nut, and the periphery of the fixing nut is sleeved with a rust prevention cover. The rust-proof cover is of a shell type structure with the bottom open, an oil storage bin is arranged in the rust-proof cover, an oil storage hole communicated with the oil storage bin is formed in the side wall of the rust-proof cover, a connecting nut is arranged at the top of the foundation bolt, and a connecting rod is arranged at the top of the connecting nut and penetrates through the top of the rust-proof cover. The device is simple and practical in structure, grease loss caused by heavy rain weather and exposur