The utility model belongs to the technical field of hoisting machinery, and discloses a pin shaft anti-rotating device for a crawler crane, which is characterized in that two keyways are milled on the outer wall of the bottom of the pin shaft and are symmetrically distributed relative to the axis of the pin shaft, and an anti-rotating key is arranged in each keyway; two slideway keyways which penetrate the whole sleeve in the axial direction are milled on the inner wall of the sleeve outside the pin shaft, and are symmetrically distributed relative to the axis of the sleeve of the pin shaft, and the anti-rotating keys can freely slide along the slideway keyways on the slideway keyways of the sleeve; and when the keys are put in the keyways, the sleeve is screwed on the joint ring of a rotary table hinging lug by nuts. The utility model has the advantages of simple structure, convenient production, does not affect the sliding function of the pin shaft, has very good anti-rotating function; and when in use, the screw thread hole of the baffle at the shaft end and the screw thread hole of the joint ring of the rotary table hinging lug can be accurately aligned so as to overcome the problem that the installation of the baffle at the shaft end has inaccurate alignment.