A pyroelectric infrared sensor based lighting control device , comprising a focusing component and at least two pyroelectric infrared sensors , wherein the focusing component comprises at least two curved surface structural portions sequentially connected adjacent to each other, the focusing component is rotationally symmetric about a central axis of the focusing component, and an angle is formed between a plane in which the bottom of any one of the curved surface structural portions is located and a plane perpendicular to the central axis of the focusing component ; wherein the pyroelectric infrared sensors and the central axis of the focusing component define an angle and overlapping regions are formed between detection regions of the pyroelectric infrared sensors ; wherein each of the curved surface structural portions corresponds to one focusing point, the at least two pyroelectric infrared sensors are respectively disposed at respective focusing points, and the focusing component is configured to focus external infrared signals onto respective pyroelectric infrared sensors ; and wherein the at least two pyroelectric infrared sensors are configured to convert changes in the infrared signals into voltage signals when any one of the pyroelectric infrared sensors detects the changes in the infrared signals, and then to control a switch status of a lighting fixture by using the voltage signals characterised in that the angle formed between the plane in which the bottom of any one of the curved surface structural portions is located and the plane perpendicular to the central axis of the focusing component is greater than 0 degrees and less than 45 degrees, or is greater than -45 degrees and less than 0 degrees. wherein the focusing component comprises at least two curved surface structural portions sequentially connected adjacent to each other, the focusing component is rotationally symmetric about a central axis of the focusing component, and an angle is formed between a plane in which the bottom of any one of the curved surface structural portions is located and a plane perpendicular to the central axis of the focusing component ; wherein the pyroelectric infrared sensors and the central axis of the focusing component define an angle and overlapping regions are formed between detection regions of the pyroelectric infrared sensors ; wherein each of the curved surface structural portions corresponds to one focusing point, the at least two pyroelectric infrared sensors are respectively disposed at respective focusing points, and the focusing component is configured to focus external infrared signals onto respective pyroelectric infrared sensors ; and wherein the at least two pyroelectric infrared sensors are configured to convert changes in the infrared signals into voltage signals when any one of the pyroelectric infrared sensors detects the changes in the infrared signals, and then to control a switch status of a lighting fixture by using the voltage signals characterised in that the angle formed between the plane in which the bottom of any one of the curved surface structural portions is located and the plane perpendicular to the central axis of the focusing component is greater than 0 degrees and less than 45 degrees, or is greater than -45 degrees and less than 0 degrees. <EOS>