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We present studies of the magnetic domain structure of UMn₂Ge₂ single crystals using a home-built low temperature magnetic force microscope. The material has two distinct magnetic ordering temperatures, originating from the Mn and U moments. At room temperature, where the Mn moments dominate, flower-like domain patterns are observed. After exposing the sample to a one-tesla magnetic field near 40K, the evolution of the magnetic domains is imaged through zero field warming up to 200 K. Near the ordering temperature of the uranium moments a clear change in the domain wall motion is observed and can be explained by a 'Slingshot' mechanism. The anti-ferromagnetic coupling between Mn and U moments, responsible for the rapid domain wall motion, is further verified by local magnetic roughness measurement. The domain size analysis of the flower-like pattern reveals that the domain structure is consistent with a model of branching domains. In addition, an in-plane anisotropy is identified to be responsible for the highly self-similar flower-like pattern. Finally, there is also evidence of nanometer scale sub-domain structure inside each branching domain, comparable with what has been reported on uniaxial magnetic material Nd₂Fe₁₄B.