The invention discloses a reciprocating blower with two-blade synchronous racks, which comprises a gear box (1), a belt pulley (2), a reduction gear (3), a crankshaft gear (3), a reduction gear shaft (31), a crankshaft (41), a rocking arm rack (5), a spline gear (6), a pinch roller component (61), a frame (7), an air valve (8), a spline shaft (9), blades (10), a casing (11), a cover (12) and an air duct concentrator (13). The invention overcomes the deficiencies in the prior high-pressure blower of difficulty to increase wind pressure, large windage loss, serious abrasion, amazing noise and high cost, and adopts the technical proposal that two blowing blades synchronously rotate back and forth for 150 degrees in a cylindrical casing separated into two air chambers by the air valve; air is sucked into through the air valve and then squeezed out. The provided two-blade synchronous reciprocating blower ensures that the high-pressure blower achieves the purposes of further increased wind pressure (larger than or equal to 100kPa) and wind rate, small windage loss, high efficiency, low noise without the need of adding a silencer, small volume and low cost.