Hot dry rock multi-cycle heating system and production method therefor

A hot dry rock multi-cycle heating system and a production method therefor. An injection well (1) and a production well (2) are drilled downwards from the ground; a first heat exchange channel (6) and second heat exchange channels (11) are obtained by manual fracturing at different depths of hot dry rock and are in a fracture swarm mode; water that is injected from the injection well (1) at least flows through the first heat exchange channel (6) and the second heat exchange channels (11) and then is drained out from the production well (2), and thus the heating process including at least two heating cycles is completed through one-time water injection and at least two times of heat exchange at different depths. Compared with the existing one-time cycling, the system does not have site requirements, repeated water injection and extraction are needless, operation is simple, and the utilization rate of the hot dry rock thermal energy is greatly improved.