The invention discloses a particle reinforcement metal-matrix composite machining device and machining method. The particle reinforcement metal-matrix composite machining device and machining method comprises a machining tank, a spindle motor, a chuck, a guide column, a fixed base, a guide device, a workpiece placing base, a workpiece and a tool electrode; work liquid in the machining tank entersa liquid storage tank through a liquid guide pipe, circular flowing of the work liquid is achieved, the interpolar workpiece liquid can be updated in time, machining stability in the discharge machining process can be effectively improved, machining efficiency is improved, machining quality is improved, in the deep small hole machining process, compared with a traditional chip removal manner, themachining effect is more obvious, meanwhile, when work liquid is replaced with an electrolyte with conductivity, the chip removal manner is used for electrolytic machining, electrochemical discharge machining and the like, the device is suitable for high-precision and high-quality deep small hole machining of various materials, the guide device and the fixed base are arranged, and the rotating precision of a tool electrode during high-speed rotation is ensured.