Multifunctional protective retaining cap

The utility model discloses a multifunctional protective retaining cap comprising two head protecting pieces which are roughly in a rectangle, wherein three sides are connected in a zipper locking manner to form a bag-shaped structure, and a simple lifting handle is arranged at the other side. On one corner of the bottom of the bag-shaped structure, interlayer protecting plates are arranged at the inner parts of the two head protecting pieces. Magic tapes are arranged at the inner sides of the head protecting pieces, close to the bag opening part of the bag-shaped structure, two shoulder protecting pieces with corresponding magic tapes are arranged additionally, magic tape connecting pieces are arranged between the shoulder protecting pieces and the head protecting pieces, and the shoulder protecting pieces are slightly smaller than the head protecting pieces, and usually stored in the inner part of the bag-shaped structure consisting of the two head protecting pieces. The magnetic tapes are respectively arra