When removing the cylinder head, it is sometimes difficult to remove the cylinder head. A simple method is now introduced to remove the cylinder head that cannot be easily removed. First, remove all the cylinder head nuts. For a single-cylinder diesel engine, after knocking over the periphery of the cylinder head with a wooden hammer, the crankshaft is quickly shaken without decompression, and the cylinder head is lifted up by the force of the compressed air. For a multi-cylinder diesel engine, after the wooden hammer vibrates over the cylinder head, the crankshaft is rotated by electric start without oil supply. If the starter is a small gasoline engine, the transmission mechanism between the starter and the host flywheel may be engaged to quickly rotate the starter flywheel.