This research focuses on the development and analysis of a centripetal plunger fluid-powered pump of a double-acting type external impeller. The pump utilizes an innovative external impeller inner stator structure, incorporating oil absorption and oil pressing centripetal cams to drive the plungers in a straight reciprocating motion along the centripetal direction. The pump achieves efficient pressure oil generation and employs a unique oil distribution system using a sliding valve. The design ensures reliable sealing, minimal leakage, and symmetrical stress distribution, while maintaining a compact structure, high volume efficiency, and low abrasion.