Refraction wave residual static correction method based on cannon first arrival

The invention provides a refraction wave residual static correction method based on cannon first arrival. Datum static correction is added to a field pickup earthquake first arrival time data body to obtain a new earthquake first arrival time data body, and then in positive and negative offsets of common shot gather and common receiver gather, refractive layer ranges are divided respectively, fitting is carried out on first arrival time and offset of a refractive layer on gather positive and negative offsets, a fitting first arrival time of each seismic channel is obtained, a fitting time difference between two of them is calculated, fitting time differences of all detection points and shot points are calculated respectively, and an average value is residual static correction of each detection point and shot point. According to the method, aiming at a condition that a refractive layer in a complex area is complex and seismic data has a low signal to noise ratio, on a field computer, calculation and processing