Disclosed is a split type hydraulic clamp used for crimping a wire pipe and a crimping method thereof. The split type hydraulic clamp comprises a hydraulic clamp body portion and a positioning portion. The positioning portion arranged on an upper mold end comprises a cross arm arranged on the upper mold end, and a first U-shaped positioning device and a second U-shaped positioning device arrangedon two sides of the cross ram. A first sliding groove and a second sliding groove are formed in two ends of the cross arm respectively. The first U-shaped positioning device is slidably fixed in the first sliding groove by means of a first adjusting bolt. The second U-shaped positioning device is slidably fixed in the second sliding groove by means of a second adjusting bolt. A first screw and thefirst U-shaped positioning device clamp a crimping pipe placed in the U-shaped positioning device tightly. A second screw and the second U-shaped positioning device clamp the crimping pipe placed inthe U-shaped positioning device tightly.