Non-contact measurement method for open-pit mine slope angle

The invention discloses a non-contact measurement method for an open-pit mine slope angle. The non-contact measurement method for the open-pit mine slope angle comprises the following steps: a. horizontally placing a distance measuring device and an angle measuring device on a flat plate at the bottom of an open-pit mine slope, and fixing the angle measuring device on the distance measuring device; b. measuring the horizontal distance L1 from the distance measuring device to the bottom line of the slope by using the distance measuring device; c. rotating the distance measuring device until the distance measuring device is aligned with a required measuring point; d. measuring the distance L2 from the distance measuring device to the measuring point; e. obtaining the rotation angle alpha of the distance measuring device by using the angle measuring device; f. calculating the slope angle beta by using a trigonometric function principle. The non-contact measurement method for the open-pit mine slope angle has the benefits as follows: the non-contact measurement method is low in application cost and simple in operation; through the measurement and calculation of the slope angle, a technical guarantee is provided for determination of a pit limit and production safety.