The present application discloses a piston rod mechanism for an air compressor, along with an air compressor. The piston rod mechanism for an air compressor comprises: a rod and a piston fixedly connected to an output end of the rod, wherein an air vent is provided within the piston, allowing air to communicate between one side of the piston facing towards the rod and the other side away from the rod; an intake valve disposed at the piston, wherein the intake valve is configured to switch between a closed position where the air vent is closed and an open position where the air vent is opened, the intake valve being made of an elastomeric material. Accordingly, the piston rod mechanism for an air compressor, as described in the present application, is capable of reducing noise during operation.