A processing system for bone-in limb meats, comprising: a right-limb incision-forming portion for forming incision on a right bone-in limb meat (M), the right-limb incision-forming portion being configured such that an incision-forming position and a configuration of an incision-forming blade are fitted to a shape of the right bone-in limb meat (M); a left-limb incision-forming portion for forming incision on a left bone-in limb meat (M), the left-limb incision-forming portion being configured such that an incision-forming position and a configuration of an incision-forming blade are fitted to a shape of the left bone-in limb meat (M); and a processing line including a conveying path and a plurality of processing stations through which the bone-in limb meat is to be conveyed, the plurality of processing stations being configured to separate a bone part (b) and a meat part (m) of each bone-in limb meat on which incision is formed at the right-limb incision-forming portion or the left-limb incision-forming portion, the processing system being characterized in that the processing line further comprises a loading portion arranged at an uppermost stream part of the conveying path of the processing line and configured to receive the right bone-in limb meat (M) with incision formed at the right-limb incision-forming portion, the right bone-in limb meat (M) being supplied from the right-limb incision-forming portion to the conveying path, and the loading portion being configured to receive the left bone-in limb meat (M) with incision formed at the left-limb incision-forming portion, the left bone-in limb meat (M) being supplied from the left-limb incision-forming portion to the conveying path, characterised in that each of the right-limb incision-forming portion and the left-limb incision-forming portion includes a plurality of first clamping units (24a, 24b) capable of moving along a corresponding conveying path (20a, 20b) while holding the bone-in limb meat, the processing line includes a plurality of second clamping units configured to convey the bone-in limb meats received from the plurality of first clamping units (24a, 24b) to the plurality of processing stations, the loading portion includes a first receiving portion configured to receive the right bone-in limb meat (M) from the right-limb incision-forming portion and a second receiving portion configured to receive the left bone-in limb meat (M) from the left-limb incision-forming portion, with distance between the fist receiving portion and the second receiving portion being the same as distance between the adjacent second clamping units, so that receiving the right bone-in limb meat (M) at the first receiving portion and receiving the left bone-in limb meat (M) at the second receiving portion are to be simultaneously performed. a right-limb incision-forming portion for forming incision on a right bone-in limb meat (M), the right-limb incision-forming portion being configured such that an incision-forming position and a configuration of an incision-forming blade are fitted to a shape of the right bone-in limb meat (M); a left-limb incision-forming portion for forming incision on a left bone-in limb meat (M), the left-limb incision-forming portion being configured such that an incision-forming position and a configuration of an incision-forming blade are fitted to a shape of the left bone-in limb meat (M); and a processing line including a conveying path and a plurality of processing stations through which the bone-in limb meat is to be conveyed, the plurality of processing stations being configured to separate a bone part (b) and a meat part (m) of each bone-in limb meat on which incision is formed at the right-limb incision-forming portion or the left-limb incision-forming portion, the processing system being characterized in that the processing line further comprises a loading portion arranged at an uppermost stream part of the conveying path of the processing line and configured to receive the right bone-in limb meat (M) with incision formed at the right-limb incision-forming portion, the right bone-in limb meat (M) being supplied from the right-limb incision-forming portion to the conveying path, and the loading portion being configured to receive the left bone-in limb meat (M) with incision formed at the left-limb incision-forming portion, the left bone-in limb meat (M) being supplied from the left-limb incision-forming portion to the conveying path, characterised in that each of the right-limb incision-forming portion and the left-limb incision-forming portion includes a plurality of first clamping units (24a, 24b) capable of moving along a corresponding conveying path (20a, 20b) while holding the bone-in limb meat, the processing line includes a plurality of second clamping units configured to convey the bone-in limb meats received from the plurality of first clamping units (24a, 24b) to the plurality of processing stations, the loading portion includes a first receiving portion configured to receive the right bone-in limb meat (M) from the right-limb incision-forming portion and a second receiving portion configured to receive the left bone-in limb meat (M) from the left-limb incision-forming portion, with distance between the fist receiving portion and the second receiving portion being the same as distance between the adjacent second clamping units, so that receiving the right bone-in limb meat (M) at the first receiving portion and receiving the left bone-in limb meat (M) at the second receiving portion are to be simultaneously performed.