The invention discloses an intrinsically safe carbon dioxide cracking and displacing integrated system. The system comprises a carbon dioxide cracker, a gas source system, a high-pressure pressurizedinjection mechanism, a big-flow medium/low-pressure injection mechanism, a first mining high-pressure hose and a second mining high-pressure hose, wherein the carbon dioxide cracker comprises a constant-pressure cracking sheet and a releasing pipe and the inner cavity of the carbon dioxide cracker does not contain a burning rod, an ignition head and carbon dioxide liquid; the gas source system iscapable of injecting carbon dioxide gas into the carbon dioxide cracker outside a drill hole; two injection holes with different sizes are formed in the tail end of the carbon dioxide cracker; the small injection hole is connected with the high-pressure pressurized injection mechanism; the big injection hole is connected with the big-flow medium/low-pressure injection mechanism; and the high-pressure pressurized injection mechanism and the big-flow medium/low-pressure injection mechanism are connected with the gas source system. The carbon dioxide cracker can be detonated by adoption of a physical method so as to realize the cracking of the working seams, and gas displacing is carried out by means of the carbon dioxide cracker so as to realize the dual purposes of the carbon dioxide cracker.