Thermal endoscope for surgical operations suitable for taking an image of an area of tissue inside the body of a patient on which a surgical operation is intended to be performed, which comprises two optical sensors sensitive to radiation in the visible field, wherein a. said thermal endoscope comprises an end part intended to be inserted in the patient's body during surgery, and three aligned optical windows placed near said end part, and the optical window placed in the center with respect to the other two optical windows, which are transparent to the radiation in the visible, is transparent to the infrared radiation; b. said optical windows (220 and 520) are coupled with the body of said thermal endoscope for surgical operations so as to form a single body properly sealed with respect to the environment in which it must operate; c. said endoscope for surgical operations also includes an infrared radiation sensor positioned inside; d. said optical window transparent to the infrared radiation is positioned so as to: i. let pass through the infrared radiation, which is susceptible to come substantially from the same portion of tissue on which the surgical operation is intended to be performed, and ii. said infrared radiation is susceptible to hit said infrared radiation sensor; e. said infrared radiation sensor consists of a matrix of elementary sensors that allow the reconstruction of a thermal image; f. said two optical windows transparent to radiation in the visible are positioned in such a way that said two optical sensors are configured to detect, through said two optical windows, two images intended to substantially concern the area of tissue on which the surgical operation is intended to be performed; wherein said thermal endoscope comprises, inside, electronic processing means and wirings suitable for the transport of signals and suitable for the electrical supply; wherein said thermal endoscope is configured to: form a stereoscopic image with a three-dimensional effect by means of said two images detected by said two optical sensors, and superimpose said thermal image detected by said infrared radiation sensor on said stereoscopic image so as to provide, by means of a suitable color rendering, information intended to concern the temperature of the tissues whose image is intended to be detected by all these sensors. a. said thermal endoscope comprises an end part intended to be inserted in the patient's body during surgery, and three aligned optical windows placed near said end part, and the optical window placed in the center with respect to the other two optical windows, which are transparent to the radiation in the visible, is transparent to the infrared radiation; b. said optical windows (220 and 520) are coupled with the body of said thermal endoscope for surgical operations so as to form a single body properly sealed with respect to the environment in which it must operate; c. said endoscope for surgical operations also includes an infrared radiation sensor positioned inside; d. said optical window transparent to the infrared radiation is positioned so as to: i. let pass through the infrared radiation, which is susceptible to come substantially from the same portion of tissue on which the surgical operation is intended to be performed, and ii. said infrared radiation is susceptible to hit said infrared radiation sensor; i. let pass through the infrared radiation, which is susceptible to come substantially from the same portion of tissue on which the surgical operation is intended to be performed, and ii. said infrared radiation is susceptible to hit said infrared radiation sensor; e. said infrared radiation sensor consists of a matrix of elementary sensors that allow the reconstruction of a thermal image; f. said two optical windows transparent to radiation in the visible are positioned in such a way that said two optical sensors are configured to detect, through said two optical windows, two images intended to substantially concern the area of tissue on which the surgical operation is intended to be performed; form a stereoscopic image with a three-dimensional effect by means of said two images detected by said two optical sensors, and superimpose said thermal image detected by said infrared radiation sensor on said stereoscopic image so as to provide, by means of a suitable color rendering, information intended to concern the temperature of the tissues whose image is intended to be detected by all these sensors.