The invention discloses a hand-piece of a coal mine scraper conveyer. The hand-piece comprises a frame and a chain wheel component; the frame comprises two vertical plates, wherein frame support seat is arranged between the two vertical plates; the chain wheel component comprises a chain wheel shaft on which a chain wheel bearing block is arranged, wherein a lubricating oil inlet is formed in the bearing block, the upper end of a frame support seat is provided with a lubricating oil filing port, a lubricating oil circulating channel is arranged on the frame support seat and a locating pin is arranged between the lubricating oil circulating channel and the lubricating oil inlet. According to the hand-piece provided by the invention, by using a locating pin which prevents axial movement and prevents the rotation of the bearing block between the lubricating oil circulating channel and the lubricating oil inlet, the inner part of the chain is lubricated by filling oil through a connector, and the connector is arranged in the frame to prevent the connector from exposing outside a vertical plate, therefore the reliability of a chain wheel can be improved; furthermore, by using a gap capable of being finely adjusted in a radial direction between the inner wall of a gap adjusting and sealing sleeve and an outer wall of the locating pin body, the locating precision of the locating pin can be improved to be convenient for the installation of the hand-piece.