The invention relates to a pneumatic direct ventricle assisting device and a controller thereof in medical device technology field, which includes an air compressor, a first medical air canal, a pressure maintaining valve, a second medical air canal, an electrical proportional valve, a third medical air canal, a first medical tee joint T, a fourth medical air canal, an electromagnetic valve, a fifth medical air canal, a vacuum dump, a six medical air canal, a second medical tee joint T, a seventh medical air canal, an air pressure sensor, an eighth medical air canal, a third medical tee joint T, a ninth medical air canal, a tenth medical air canal, a cyathiform body, and a blood pressure sensor. The controller controls the air compressor and the vacuum valve to alternately deliver air through the respective air canals to the cyathiform body, so as to help the heart being assisted to contract and relax. When the air is periodically filled in the space between the shell and the intima, contraction force for the outer wall of the heat is supplied; when the air is periodically pumped out from between the shell and the intima, the intima restates, and the diastole happens.