The invention relates to a five-line parallel small-spacing shallow buried large-section tunnel group construction method and belongs to the field of tunnel engineering. The five-line parallel small-spacing shallow buried large-section tunnel group construction method comprises the following steps that (1) tunnel excavation collapse and heading slope deformation are prevented through five tunnel portals, and measures of advanced large pipe sheds, advanced small guide pipes, advanced pre-grouting and the like are adopted; (2) five parallel tunnels B1 to B5 are synchronously constructed at the interval of a certain distance in the axis direction and synchronously propelled, a CD method is adopted for construction at the position with the good geological condition, and the method is adjustedto be a CRD method for construction at the position with the poor geological condition; and (3) anchor spraying and I-shaped steel frames are adopted for primary and secondary supporting of the tunnels, reinforced concrete structures are adopted as secondary linings, inverted arches are constructed firstly, and then side walls are constructed. According to the five-line parallel small-spacing shallow buried large-section tunnel group construction method, the problem of five-line parallel small-spacing shallow buried large-section tunnel group synchronous construction is solved, the risks of slope settlement and tunnel collapse are effectively reduced, and the safe, rapid and economical construction process is guaranteed.