The invention relates to a flat triangular pyramid shaped sensor for photovoltaic module tracking, which comprises a triangular pyramid frustum shaped sensor and is characterized in that the top surface and three side surfaces of the sensor are provided with photoresistors R1, R2, R3 and R4 respectively. Arrangement of the photoresistors is changed from planar two-dimensional arrangement of a traditional four-quadrant photoelectric detector into triangular pyramid shaped stereo three-dimensional arrangement, thereby enabling the normal angle, the direction and the lighting range of each photoresistor to be different, and being capable of increasing the measurement range and improving the measurement precision. The photoresistors on adjacent planes are different in light reception area when light at the view angle direction irradiates on the detector, and the light intensity is higher when the light reception area is larger under the same illumination, thereby being capable of improving the precision of the sensor. Compared with a plane distributed photoelectric component, the flat triangular pyramid shaped sensor is higher in sensitivity.