Quick change device for lifting appliance of crane

The utility model discloses a quick-change device for a lifting appliance of a crane, which comprises a positioning disc and the lifting appliance, the lower part of the positioning disc is provided with two positioning and clamping structures which are oppositely arranged, and a positioning groove is formed between the two positioning and clamping structures; the upper part of the lifting appliance is connected with a fixing module matched with the positioning groove through a connecting rib plate; each positioning and clamping structure comprises a positioning base, a through groove is formed in each positioning base, a clamping block is arranged in each through groove in a sliding fit mode, and driving mechanisms which drive the corresponding clamping blocks to move relatively and enable the fixing modules to be fixed in the positioning grooves are arranged on the two opposite back sides of the two positioning bases. According to the utility model, the lifting appliance can be quickly positioned and fixed,