The invention provides a multifunctional safe and sanitary mobile phone protecting case which is mainly composed of a main housing, a buckling side, turning openings, a turning side, an overturning cover, short through troughs, through corner troughs, long through troughs and rotatable fasteners, wherein the main housing, the buckling side, the turning opening, the turning side, the overturning cover, the short through troughs, the through corner troughs, the long through troughs and the rotatable fasteners are arranged on a main body and an auxiliary body. The main housing is the main housing part of the mobile phone protecting case. The buckling side is arranged at the inside of the main housing and is groove-shaped. The turning openings are arranged on the upper side and the lower side of the main housing and have shape and size which are same with one end of the turning side. The turning side is arranged at one side of the turning cover in a projected manner, and one end of the turning side matches the turning openings. The overturning cover is arranged in an upper or lower hollow part of the main housing. The short through troughs are arranged at the upper side and the lower side of the main housing and are internally provided with hook tapes. The through corner troughs are arranged at corners of the main housing and are hollow. The long through troughs are arranged at two or more than two in the left side and the right side of the main housing. The rotatable fasteners are arranged in the upper turning opening and the lower turning opening and the end of the turning side. Therefore the multifunctional safe and sanitary mobile phone protecting case has substantial comprehensive economic benefit and substantial social benefit in popularization.