A multi-section finger sleeve-type probe comprising a finger sleeve body, comprising a flexible flat cable mounted on the finger sleeve body, a light emitting diode mounted on the finger sleeve body and electrically connected to one end of the flexible flat cable, a photo diode mounted on the finger sleeve body and electrically connected to the other end of the flexible flat cable, and a wire with one end thereof electrically connected to the flexible flat cable; the other end of the wire being used for being electrically connected to an external device; the finger sleeve body being a cylinder with an opening at the bottom thereof; the multi-section finger sleeve-type probe being worn on a finger through the opening of the bottom of the finger sleeve body, the front and rear sides of the finger sleeve body respectively corresponding to fully contact the finger back and the finger pulp of the finger, and the left and right sides of the finger sleeve body respectively corresponding to fully contact the left and right sides of the finger; the finger sleeve body correspondingly wrapping around all sides of the finger closely, the finger sleeve body from top to bottom comprising a first knuckle sleeve and a second knuckle sleeve connecting therewith respectively corresponding to the distal knuckle and the medial knuckle of the finger, wherein the material of the finger sleeve body is an elastic material; wherein the rear side of the finger sleeve body is provided with a bending structure between the first knuckle sleeve and the second knuckle sleeve, thereby facilitating the bending of the finger when the multi-section finger sleeve-type probe is worn on a finger; the bending structure is a gap, or a groove; wherein the first knuckle sleeve is provided with the light emitting diode and the photo diode; wherein the inner diameter of the second knuckle sleeve is less than or equal to the inner diameter of the first knuckle sleeve; and wherein, the inner diameter of the second knuckle sleeve refers to an inner diameter when the second knuckle sleeve is expanded into a cylindrical shape without elastic deformation; and the inner diameter of the first knuckle sleeve refers to an inner diameter when the circumferential portion of the first knuckle sleeve at where the light emitting diode and the photo diode are located and the part below the circumferential portion are expanded into a cylindrical shape without elastic deformation. the finger sleeve body being a cylinder with an opening at the bottom thereof; the multi-section finger sleeve-type probe being worn on a finger through the opening of the bottom of the finger sleeve body, the front and rear sides of the finger sleeve body respectively corresponding to fully contact the finger back and the finger pulp of the finger, and the left and right sides of the finger sleeve body respectively corresponding to fully contact the left and right sides of the finger; the finger sleeve body correspondingly wrapping around all sides of the finger closely, the finger sleeve body from top to bottom comprising a first knuckle sleeve and a second knuckle sleeve connecting therewith respectively corresponding to the distal knuckle and the medial knuckle of the finger, wherein the material of the finger sleeve body is an elastic material; wherein the rear side of the finger sleeve body is provided with a bending structure between the first knuckle sleeve and the second knuckle sleeve, thereby facilitating the bending of the finger when the multi-section finger sleeve-type probe is worn on a finger; the bending structure is a gap, or a groove; wherein the first knuckle sleeve is provided with the light emitting diode and the photo diode; wherein the inner diameter of the second knuckle sleeve is less than or equal to the inner diameter of the first knuckle sleeve; and wherein, the inner diameter of the second knuckle sleeve refers to an inner diameter when the second knuckle sleeve is expanded into a cylindrical shape without elastic deformation; and the inner diameter of the first knuckle sleeve refers to an inner diameter when the circumferential portion of the first knuckle sleeve at where the light emitting diode and the photo diode are located and the part below the circumferential portion are expanded into a cylindrical shape without elastic deformation.