Wave-absorbing rubber, preparation method thereof and wave-absorbing device

The invention provides wave-absorbing rubber, a preparation method thereof and a wave-absorbing device. The preparation method of the wave-absorbing rubber comprises the steps that raw rubber, a catalyst, filler, a magnetic wave-absorbing agent and a cross-linking agent are subjected to room-temperature vulcanization, room-temperature vulcanized rubber is obtained, and the magnetic wave-absorbing agent is selected from one or more of the group consisting of dendritic carbonyl iron, flaky Fe-Si-Al, fibrous carbonyl iron and flaky Fe-Si-Zr; and performing vacuum magnetic field induction on the room-temperature vulcanized rubber to obtain the wave-absorbing rubber. The magnetic wave-absorbing agent is doped into the room-temperature vulcanized rubber, and the magnetic field induction method is utilized to enable the magnetic wave-absorbing agent to be subjected to specific orientation arrangement in the room-temperature vulcanized rubber, so that on one hand, the addition amount of the magnetic wave-absorbing ag