Variable-compression-ratio internal combustion engine and automobile thereof

The invention discloses a variable-compression-ratio internal combustion engine and an automobile. The variable-compression-ratio internal combustion engine comprises a cylinder body, a cylinder cover, a piston, a piston pin, a connecting rod, an air inlet channel, an air inlet valve, an exhaust channel and an exhaust valve. The cylinder cover is mounted on the cylinder body, and the cylinder cover, the cylinder body and the piston form a combustion chamber. One end of the connecting rod is rotationally connected with the piston pin, and the other end of the connecting rod is rotationally connected with a crankshaft of the engine. The air inlet channel and the air outlet channel are formed in the cylinder cover, the air inlet valve is arranged on the air inlet channel, and the air outlet valve is arranged on the air outlet channel. The variable-compression-ratio internal combustion engine further comprises an adjusting air channel and an adjusting air valve. The adjusting air channel is arranged on the cylind