A mini-transducer for Mssbauer is described in this paper. The mini-transducer uses SmCo5 magnets instead of AlNiCo5. The mini-transducer is featured by its weight (1360 g) and size (Φ67.5 mm×113.5 mm). The ratio between error signal value and the velocity signal(peak-to-peak) is lower than 0.4%. At room temperature

the average Mssbauer line width of the inner lines of a 25 μm α-Fe foil is less than 0.23 mm/s. The transducer can be used to measure Mssbauer spectrum with long-time stability.