The invention discloses an indoor temperature controller used for controlling water flows based on thermal strain. The indoor temperature controller is characterized by comprising a columnar shell, and the cross section of the columnar shell is a 45-135-degree fan. The arc surface of the columnar shell is provided with a transparent sealing cover. An annular water flow inlet is formed in the top of the columnar shell in the circumferential direction. A fan-shaped water flow outlet is formed in one side of the bottom of the columnar shell in the radial direction. A dual metal sheet used for adjusting the size of the annular water flow inlet is arranged inside the columnar shell and opposite to the fan-shaped water flow outlet in the longitudinal direction. The dual metal sheet is arranged in the radial direction of the columnar shell, and one side edge of the dual metal sheet is fixedly connected with the edge of the inner wall of the columnar shell. The dual metal sheet is twisted androtated in the columnar shell under driving of thermal strain. The indoor temperature controller used for controlling water flows based on thermal strain has the advantages that automatic temperaturecontrol is achieved, the sensitivity is high, the structure is simple, the occupied space is small, maintenance is not needed, manufacturing is convenient, and portability and reliability are achieved.