The invention discloses a sand blasting device. The sand blasting device comprises a box body, a sand blasting machine body and a cross board, the two ends of the cross board are slidably connected with the left side wall and the right side wall of the box body respectively, the sand blasting machine body is fixedly connected to the cross board, a walking mechanism is arranged on the lower end ofthe box body, a fixing block is fixedly connected with the bottom of the interior of the box body, the upper end of the fixing block is provided with a first groove, the left side wall and the right side wall of the first groove are provided with second grooves respectively, a movable rod penetrates through the bottoms of the second grooves, a fixing board is fixedly connected with the end, closeto the first groove, of the movable rod, a plurality of connection blocks are arranged on the side walls of the interiors of the second grooves, limiting grooves are arranged on the opposite side walls of the plurality of connection blocks, a plurality of limiting blocks matched with the limiting grooves are arranged on the movable rod, the parts, located in the second grooves, of the movable rodare sleeved with springs, and an adjusting mechanism used for adjusting the cross board is arranged on the right side wall of the box body. The sand blasting device can adjust the sand blasting machine body, can limit to-be-processed pieces, and is easy to operate.