The invention discloses an opencast mine bottom cleaning machine belonging to the technical field of mining equipment. According to the technical scheme, the opencast mine bottom cleaning machine comprises a frame, a rotary table, a mechanical rock breaking mechanism, a powerful hydraulic breaking hammer, a rake loading mechanism and a scraper conveying mechanism, wherein a crawler traveling system is respectively arranged on each of two sides of the frame, and the rake loading mechanism is arranged at the front end of the frame; the scraper conveying mechanism is arranged on the frame, and the front end of the scraper conveying mechanism is connected with the rear end of the rake loading mechanism; the rotary table is arranged on the frame, and the mechanical rock breaking mechanism and the powerful hydraulic breaking hammer are arranged on the upper part of the rotary table. Hard mine bedrock is broken by utilizing the mechanical rock breaking mechanism and the powerful hydraulic breaking hammer, the broken bedrock is collected and transferred by utilizing the rake loading mechanism and the scraper conveying mechanism, and continuous high-efficiency breaking and shoveling operations of the mine bedrock are realized. The waiting time of a single bucket excavator is greatly reduced, the advance rate of an opencast mine operating line is improved, and the safety of personnel and equipment nearby the operating line can be ensured.