Provided are a data packet transmission system and method, the system includes: an Agent device, a first connecting device, a MAC array, a second connecting device, a PHY array, a third connecting device and an RF array, where the Agent device sends data of a first data frame to the first connecting device, and the first connecting device sends a data packet to a destination MAC device in the MAC array; the destination MAC device sends a second data frame to the second connecting device; the second connecting device sends the data packet to a destination PHY device in the PHY array; the destination PHY device sends a third data frame to the third connecting device; and the third connecting device sends the data packet to a destination RF device in the RF array, and the destination RF device sends the data packet to a user side.