Anti-collision protection device of crane

The utility model discloses an anti-collision protection device of a crane, and relates to the technical field of crane equipment. The limiting device comprises a limiting switch and a mounting base fixed at the upper end of the end part of the crane end beam, wherein an adjusting guide rail is fixed in the middle of the upper end of the mounting base; an adjusting sliding block is installed on the adjusting guide rail in a front-back sliding mode. A guide sleeve is fixed at the upper end of the adjusting slide block; a guide rod is mounted in the guide sleeve in a sliding manner; a starting ring is slidably mounted on the guide rod on the front side of the sleeve; a starting rod is fixedly mounted on the lower side of the starting ring; a limit switch is fixedly mounted at the front end of the guide slider; a mounting plate is fixed at the front end of the starting rod; an overturning plate is rotationally mounted at the upper end of the mounting plate through a rotating shaft; the lower ends of the two tele