The invention provides an anti-climbing protection part for a downpipe and relates to a protection tool for the downpipe. The anti-climbing protection part for the downpipe solves the problem that the downpipe can easily serve as a climbing tool for burglary. The anti-climbing protection part comprises a fixing portion and an anti-climbing portion. The anti-climbing portion is provided with a plurality of sharp portions protruding outwards. The fixing portion comprises two arc boards and installation boards connected to the two ends of each arc board respectively. Each installation board is horizontal. An installation hole is formed in each installation board. The opposite sides of the two arc boards are provided with connection holes respectively. The two ends of the anti-climbing portion are fixed to the two arc boards respectively through the connection holes. The anti-climbing protection part is fixed to every two adjacent downpipe hoops through the fixing portion, the downpipe is covered with the anti-climbing portion, the anti-climbing portion can be detached when the downpipe needs to be repaired, the antitheft function can be achieved, and maintenance is convenient. Each installation board of the fixing portion is movably connected with the corresponding arc board through one side, only the fixedly-connected end of each installation board is detached when the corresponding installation board is detached, the anti-climbing portion can be opened after the installation boards are detached, the downpipe is exposed, and the anti-climbing protection part for the downpipe does not need to be completely detached.