The invention discloses an anti-corrosion type one-way throttling valve. The anti-corrosion type one-way throttling valve comprises a valve body, an inlet, an outlet and an adjusting pipe. An adjusting rod is arranged in the adjusting pipe. The end, on the outer side of the adjusting pipe, of the adjusting rod is provided with a locking nut, and the adjusting pipe is sleeved with an anti-corrosioncover body. A seal hoop device is arranged at the opening position of the anti-corrosion cover body and comprises an annular hoop ring sleeving the opening end of the anti-corrosion cover body. One end of the hoop ring is opened and is provided with a fastening bolt structure. Comprehensive and reliable anti-corrosion protection can be conducted on the one-way throttling valve, and meanwhile theoperation precision of the one-way throttling valve is guaranteed under the situation that the anti-corrosion cover body is not taken down; and the anti-corrosion seal performance of the device is further improved, and the service life of the device is further prolonged.