High-sealing secondary high-pressure pump

Disclosed is a high-sealing secondary high-pressure pump, namely an air pump. A reduction gearbox (7) is arranged in front of a motor (6). A crank shaft (8) is connected with an output shaft (20) of the reduction gearbox (7). One side of a connection rod (9) is connected with the crank shaft (8), and the other side thereof is connected with a primary piston (4). A primary check valve (41) is arranged at one end of the primary piston (4), and an air storage chamber (18) is arranged in the middle of the primary piston (4). The other end of the primary piston (4) is connected with a secondary piston rod (19) in a high-sealing mode. An air hole (192) is formed in the middle of the secondary piston rod (19), and the other end thereof is connected with a high-pressure piston (10). A secondary check valve (191) is arranged in a secondary high-pressure piston (10). A noise-reduction filter (1) and a check valve block (31) are arranged at an air inlet of a primary air cylinder cover (2), and a cooling device (5) is arranged on the outer side of a secondary air cylinder (11). The secondary air cylinder (11) is arranged on one side of a high-pressure air cylinder cover (12). A pressure limiting anti-explosion device (17) is arranged on the other side of the high-pressure air cylinder cover (12). One end of a high-pressure air pipe (13) is connected with one side of the high-pressure air cylinder cover (12), and the other end of the high-pressure air pipe (13) is connected to the high-pressure filter (15). In the air pump, the primary air cylinder and the second air cylinder are coaxial in a 180-degree mode, the force in the work process is balanced, the size is small, energy conservation and environment protection are achieved, the pressure of output air is high, and the sealing is high.