A modular lighting device with multi-region detection function, comprising: a housing; and a light-emitting diode module; and characterized by further comprising: a rotary spherical seat, which comprises a bottom base and a sphere, the sphere having a front end portion comprising a plurality of positioning holes formed therein; a detection module, which comprises a plurality of sensors mounted on a substrate, the sensors being respectively embedded in the positioning holes; a control module, which has a front end on which a camera lens is mounted to be embedded in one of the positioning holes, the control module being arranged to extend through a central portion of the detection module; a fixing casing, which is arranged outside the rotary spherical seat and mounted to an upper end of the housing to constrain a rotational range of the sphere; and a main power supply board, which is electrically connected to the LED module, the detection module, and the control module to allow the control module to drive the LED module and the detection module to each perform a corresponding operation and achieve functions of detection, recording, and lighting in multiple ranges, wherein the detection module and the control module are adjustable in angular positions thereof. a housing; and a light-emitting diode module; and characterized by further comprising: a rotary spherical seat, which comprises a bottom base and a sphere, the sphere having a front end portion comprising a plurality of positioning holes formed therein; a detection module, which comprises a plurality of sensors mounted on a substrate, the sensors being respectively embedded in the positioning holes; a control module, which has a front end on which a camera lens is mounted to be embedded in one of the positioning holes, the control module being arranged to extend through a central portion of the detection module; a fixing casing, which is arranged outside the rotary spherical seat and mounted to an upper end of the housing to constrain a rotational range of the sphere; and a main power supply board, which is electrically connected to the LED module, the detection module, and the control module to allow the control module to drive the LED module and the detection module to each perform a corresponding operation and achieve functions of detection, recording, and lighting in multiple ranges, wherein the detection module and the control module are adjustable in angular positions thereof. a rotary spherical seat, which comprises a bottom base and a sphere, the sphere having a front end portion comprising a plurality of positioning holes formed therein; a detection module, which comprises a plurality of sensors mounted on a substrate, the sensors being respectively embedded in the positioning holes; a control module, which has a front end on which a camera lens is mounted to be embedded in one of the positioning holes, the control module being arranged to extend through a central portion of the detection module; a fixing casing, which is arranged outside the rotary spherical seat and mounted to an upper end of the housing to constrain a rotational range of the sphere; and a main power supply board, which is electrically connected to the LED module, the detection module, and the control module to allow the control module to drive the LED module and the detection module to each perform a corresponding operation and achieve functions of detection, recording, and lighting in multiple ranges, wherein the detection module and the control module are adjustable in angular positions thereof.