The invention provides a microalgae tubular photobioreactor and a system thereof, and belongs to the field of bioengineering. The microalgae tubular photobioreactor comprises a stirring and circulating mechanism, the stirring and circulating mechanism comprises an inner stirring mechanism and an outer stirring mechanism, the inner stirring mechanism comprises fixed guide rods and a stirring ball, the outer stirring mechanism comprises guide rails, a traction belt and a guide magnetic block, and a guided magnetic block is embedded at the side, tangent to the inner wall of a pipeline, of the stirring ball, is arranged corresponding to the guide magnetic block and is capable of moving through pipeline magnetic conduction. A microalgae tubular photobiological reaction system comprises the microalgae tubular photobioreactor, and an automatic valve is arranged on a liquid outlet. The microalgae tubular photobioreactor uses movement of the stirring ball for stirring and circulating microalgae, and compared with the prior art, mechanical damage to the microalgae by mechanical stirring is greatly reduced. The microalgae tubular photobioreactor is further improved by the microalgae tubular photo-biological reaction system.