Safety structure for lamp bulb interchange

The utility model relates to a safety structure for interchanging bulbs, which is combined with a control bulb group and a common bulb group. The safety structure for interchanging bulbs is characterized in that the control bulb group comprises a control bulb, a control lamp socket, and a control lamp holder, wherein the side part of the control lamp socket is provided with a groove which is arranged in approximately same angle position with a current conducting wire of the bulb and the corresponding position on the inner side of an opening of the control lamp holder is provided with a flange. The common bulb group comprises a common bulb which is combined with a common lamp socket so as to be combined inside a common lamp holder integrally, wherein the side part of the common lamp socket is provided with a groove which is also arranged slantways in an approximate angle with a current conducting wire of the common bulb. The corresponding position on the inner side of an opening of the common lamp holder is provided with a flange. When the control bulb and the common bulb are interchanged and combined, the control bulb and the common bulb can be avoided to conduct current by the safety structure for interchanging bulbs. Thus, the safety effect of wrong combination, namely, no current is realized.