The invention discloses a double-edged kitchen knife. The double-edged kitchen knife comprises a knife handle and a knife body and further comprises a knife sheath, a rotating shaft and a positioning inserted pin, wherein both the two sides of the knife body are edged to form a first edge and a second edge. The first edge and the second edge are symmetrical about the central axis of the knife body, the shape of the knife sheath is the same as the shape of the first edge, and the size of the knife sheath is larger than the size of the first edge. The knife handle is arranged in the middle of the lateral face of the knife body, the rotating shaft is arranged at the joint of the knife handle and the knife body, a corner of the knife sheath is connected with the rotating shaft, and the knife sheath can rotate by 360 degrees around the rotating shaft. A positioning hole is formed in the side, away from the knife handle, of the knife body, a positioning hole is further formed in the position, corresponding to the knife body, of the knife sheath, and the positioning inserted pin penetrates through the positioning hole so that the relative position between the knife sheath and the knife body can be fixed. The two edges of the double-edged kitchen knife can be used for different purposes, the functions of two kitchen knives are achieved through the kitchen knife, and meanwhile the use process is made to be quite safe due to the protection effect of the knife sheath. The kitchen knife is simple in structure and convenient to use.