The invention discloses a grinding assembly of an industrial grinding robot. The grinding assembly is divided into two parts, wherein each part is composed of a support seat, a press rod, a press plate, a connection block, a gear ring, a fixing plate, a grinding disc, an ejection rod, a grinding motor, a gear and a connection rod; the support seat is fixed to the tail end of a robot arm; the pressrod penetrates through from one end of the support seat, and the press plate is fixed to the tail end of the press rod; the connection block and the gear ring sequentially sleeve the periphery of therod body of the press rod; the gear ring is fixedly connected to the outer side of the fixing plate; the grinding disc is fixed to the inner side of the fixing plate; the grinding disc is formed through combining a plurality of grinding disc blocks; a fixing hole and a dust collection groove are formed in the block body of each grinding disc block; the ejection rod and the grinding motor are fixed to the support seat in parallel; the gear is fixed to the grinding motor through a movable rod; and the gear is engaged with the gear ring. According to the grinding assembly disclosed by the invention, through arrangement for a double-sided grinding mechanism, double-sided grinding is realized, and the grinding efficiency is increased; and meanwhile, the grinding disc is configured to be of a split structure, so that replacement for the damaged grinding disc block is facilitated, and the use cost is lowered.