Microsatellite unfolding mechanism

The invention relates to the field of unfolding of small-sized spacecraft equipment, in particular to a microsatellite unfolding mechanism. The microsatellite unfolding mechanism comprises upper bases, lower bases and band-shaped spring assemblies, wherein the upper bases are symmetrically fixed above the lower bases; the band-shaped spring assemblies are located in gaps between the upper bases and the lower bases; the matching gap between each upper base and the corresponding lower base is composed of three arcs; when the upper bases and the lower bases are placed symmetrically, the gaps formed between the upper bases and the lower bases are used for mounting of the band-shaped spring assemblies; the radian of the arcs coincides with the radian of the band-shaped spring assemblies which can be bent forwards and backwards. The self unfolding of a structure can be achieved through stress generated by bending of the unfolding mechanism, required locking force is provided itself after the structure is unfolded so as to achieve the self-locking state, and spatial self unfolding and self locking motion of the structure are achieved.