The invention provides a tight oil energy supplying method of alternating displacement and imbibition oil displacement between horizontal well sections. The method comprises the steps that reservoirsare selected and classified, the reservoirs are classified into level I, level II and level III, and deploy and exploit of horizontal wells are implemented in sequence according to the I, II and III level reservoirs. According to the novel method, water injection well and oil well classification, small well spacing and small section spacing are optimized, segmented lateral displacement and imbibition oil displacement are combined, and rapid water injection energy supplying of tight oil horizontal wells and the same rows of continuous interval wells is achieved; the difficult problem that pressure between artificial cracks cannot be improved effectively is solved; the problem that energy sullying of current tight oil reservoir horizontal well developing is difficult is overcome; and the effect of imbibition oil displacement is achieved to the greatest extent.