The invention provides a pair of briefs capable of being put on and taken off easily and collecting dirt easily and a system, and relates to the technical field of medical equipment. The pair of briefs capable of being put on and taken off easily comprises a briefs body with a discharge outlet, a dirt collector and a connecting piece connected with the briefs body and the dirt collector. The connecting piece comprises a first connecting portion arranged on the edge of the discharge outlet and a second connecting portion fixed to the edge of the opening of the dirt collector. The first connecting piece and the second connecting piece are each provided with an annular rubber piece. The two annular rubber pieces are provided with magnetic pieces with opposite positions. When the pair of briefs is in use, the two annular rubber pieces are attracted through the magnetic pieces, the briefs body and the dirt collector can be detachably connected, the dirt collector and the briefs body are easily combined and separated, and the pair of briefs is convenient to use. Due to the two annular rubber pieces, the briefs body and the dirt collector are more easily connected, the structure is simple, and the fixing and disassembling can be achieved easily.