The invention discloses an industrial waste heat and solar energy combined cross-season heat accumulation and regional heat supply system, and belongs to the technical field of regional heat supply. The system comprises an industrial waste heat recycling device, a solar heat collector, a ground heat exchanger, a low-temperature hot water heat collecting tail end device, a connecting pipeline, a plurality of sets of circulation pumps and a plurality of sets of valves. The industrial waste heat recycling device is connected with the solar heat collector, the ground heat exchanger and the low-temperature hot water heat collecting tail end device in series or in parallel through the valves, the circulation pumps and the connecting pipeline to form a switchable heat accumulation and heat supply loop. The cross-season heat accumulation manner is adopted in the system, heat in summer is used in winter, and the yearly utilization rate of a solar system and an industrial waste heat system is increased. Meanwhile, the system heat taking and releasing procedure is optimized, the heat of soil is extracted through direct heat exchange in the manner of improving the temperature grade of the underground soil instead of adopting soil balance temperature heat supplementation, and waste of the energy grade due to utilization of a heat pump is avoided.