The invention relates to an automatic mortar device applied to a laboratory. The mortar device comprises a bracket; the bracket is provided with a mortar pounder sleeve; the lower end of the mortar pounder sleeve is connected with a mortar pounder; a mortar tray is below the mortar pounder, and is provided with a mortar fixed buckle; a mortar is fixed on the mortar tray; the mortar device is provided with a gear speed reducing moor; an output gear of the gear speed reducing motor is connected with the tray through an eccentric shaft combination; and the gear speed reducing motor is controlled through a control panel. The automatic mortar device is simple in structure, convenient for operation, labor-saved and excellent in grinding effect, stores all grinded materials in the mortar, is low in material loss after and before operations, is short in powder material mixing time, and is excellent in effect.