The invention discloses an external gear pump for strengthening dynamic-pressure lubrication effect of the gear end surface. The inner lateral side of a floating side plate of the gear pump consists of an upper part, a center part and a lower part; the upper part is the part above the center of a drive gear, the lower part is the part below the center of a driven gear, and the center part is the rest; the upper part and the lower part are an inclined plane, and the inclined plane from one side close to an oil-discharging chamber to one side closed to an oil absorbing chamber is inclined gradually to the direction away from the gear end surfaces of the driving gear and the driven gear, so that an oil wedge structure with convergence characteristic is formed in the end clearance of the driving gear and the driven gear; the center part is a vertical plane; and unloading grooves are arranged on the center part, and the unloading groove at the oil absorption side is communicated with shaft holes and the larger opening of the end clearance. According to the external gear pump provided by the invention, by changing the shape of the inside lateral side surface of the floating side plate, the dynamic-pressure lubrication effect of the gear end surface is strengthened, and consequently the lubricity of the pump is improved.