The invention discloses a sealing system of a mechanical vibrator, comprising a filter, a sealing ring mounted on a piston close to one end of a trip rod, a piston ring sleeved on the piston, and guide rings mounted on a piston rod close to one end of a cylinder in a piston guide barrel. A gasket is mounted on the piston guide barrel between two guide rings, the piston guide barrel close to a spring base and a guide ring end is provided with a hole. The hole communicates with exterior of the mechanical vibrator and the interior of the piston guide barrel to form an air inlet communicating with an air source. The advantages of the invention are that the working pressure of a sealing element is reduced and frication between the piston rod and the piston position is reduced, as the sealing system of the mechanical vibrator brings in gas sealing; synchronously, the invention further brings in a gas leakage alarm device and monitors the sealing system of the mechanical vibrator in real time. The integral sealing structure of the system is rationally designed and has low cost. The service life of the sealing element is long and the sealing system is used in the working condition that the mechanical vibrator works at high temperature, under high pressure and with dusty medium.