The invention provides an indoor intelligent geothermal heater, comprising a water divider, an instant heating type electric heater, a circulating pump, intelligent temperature controllers, a water adding bucket, a water return pipe, a water supply pipe, a solar thermal collector, a solar energy intensity detector, a solar panel and a storage cell; the control ends of the circulating pump and the instant heating type electric heater are connected with the intelligent temperature controllers, the water adding bucket is disposed on the water return pipe and in front of the circulating pump; the intelligent temperature controllers are connected with the solar energy intensity detector, the other ends of the intelligent temperature controllers are connected with the solar thermal collector; the solar thermal collector is connected with the instant heating type electric heater; the power end of the instant heating type electric heater is connected with the storage cell, and the storage cell is connected with the solar panel. The indoor intelligent geothermal heater can detect if the external solar energy is sufficient or not automatically, and performs geothermal heating with the solar heating manner preferably, therefore the resource is saved, and the heating cost is reduced greatly.