An ultra-large bandwidth data transmission method, comprising: transmitting, by a ultra-large bandwidth data transmission device, data in a subframe level manner of a Long Term Evolution, LTE, system with a specific bandwidth, wherein the specific bandwidth comprises 1.4 MHz bandwidth, 3 MHz bandwidth, 5 MHz bandwidth, 10 MHz bandwidth or 20 MHz bandwidth, and wherein transmitting, by the ultra-large bandwidth data transmission device, the data in the subframe level manner of the LTE system with the specific bandwidth comprises: when the ultra-large bandwidth data transmission device transmits the data, adopting a sampling rate of the ultra-large bandwidth data transmission device being m/n times of a sampling rate corresponding to the LTE system with the specific bandwidth, m representing a multiple frequency number of the sampling rate corresponding to the LTE system with the specific bandwidth and n representing a fractional frequency number of the sampling rate corresponding to the LTE system with the specific bandwidth, m and n being positive integers and a value range of n being from 1 to m-1, where m=(p1^k1) ×(p2^k2) ×,..., ×(pi^ki), k1 to ki are exponents, values of k1 to ki are natural numbers, p1 to pi are bases corresponding to k1 to ki, values of p1 to pi are prime numbers and are not equal to one another, the values of p1 to pi are from 2, 3, or 5 and the values of k1 to ki are from 1, 2, 3 or 6; and when the ultra-large bandwidth data transmission device transmits the data, adopting subcarrier spacing which is calculated according to an equation of the sampling rate of the ultra-large bandwidth data transmission device = the subcarrier spacing × a Fast Fourier Transformation, FFT, point number corresponding to the LTE system with the specific bandwidth, wherein the ultra-large bandwidth comprises 75MHz, 500MHz, 600MHz or 1GHz. transmitting, by a ultra-large bandwidth data transmission device, data in a subframe level manner of a Long Term Evolution, LTE, system with a specific bandwidth, wherein the specific bandwidth comprises 1.4 MHz bandwidth, 3 MHz bandwidth, 5 MHz bandwidth, 10 MHz bandwidth or 20 MHz bandwidth, and wherein transmitting, by the ultra-large bandwidth data transmission device, the data in the subframe level manner of the LTE system with the specific bandwidth comprises: when the ultra-large bandwidth data transmission device transmits the data, adopting a sampling rate of the ultra-large bandwidth data transmission device being m/n times of a sampling rate corresponding to the LTE system with the specific bandwidth, m representing a multiple frequency number of the sampling rate corresponding to the LTE system with the specific bandwidth and n representing a fractional frequency number of the sampling rate corresponding to the LTE system with the specific bandwidth, m and n being positive integers and a value range of n being from 1 to m-1, where m=(p1^k1) ×(p2^k2) ×,..., ×(pi^ki), k1 to ki are exponents, values of k1 to ki are natural numbers, p1 to pi are bases corresponding to k1 to ki, values of p1 to pi are prime numbers and are not equal to one another, the values of p1 to pi are from 2, 3, or 5 and the values of k1 to ki are from 1, 2, 3 or 6; and when the ultra-large bandwidth data transmission device transmits the data, adopting subcarrier spacing which is calculated according to an equation of the sampling rate of the ultra-large bandwidth data transmission device = the subcarrier spacing × a Fast Fourier Transformation, FFT, point number corresponding to the LTE system with the specific bandwidth, when the ultra-large bandwidth data transmission device transmits the data, adopting a sampling rate of the ultra-large bandwidth data transmission device being m/n times of a sampling rate corresponding to the LTE system with the specific bandwidth, m representing a multiple frequency number of the sampling rate corresponding to the LTE system with the specific bandwidth and n representing a fractional frequency number of the sampling rate corresponding to the LTE system with the specific bandwidth, m and n being positive integers and a value range of n being from 1 to m-1, where m=(p1^k1) ×(p2^k2) ×,..., ×(pi^ki), k1 to ki are exponents, values of k1 to ki are natural numbers, p1 to pi are bases corresponding to k1 to ki, values of p1 to pi are prime numbers and are not equal to one another, the values of p1 to pi are from 2, 3, or 5 and the values of k1 to ki are from 1, 2, 3 or 6; and when the ultra-large bandwidth data transmission device transmits the data, adopting subcarrier spacing which is calculated according to an equation of the sampling rate of the ultra-large bandwidth data transmission device = the subcarrier spacing × a Fast Fourier Transformation, FFT, point number corresponding to the LTE system with the specific bandwidth, wherein the ultra-large bandwidth comprises 75MHz, 500MHz, 600MHz or 1GHz.