Safety switch system for mower

The invention relates to a safety switch system for a mower, which comprises a trigger switch, a safety switch and a trigger lever, wherein the trigger switch controls on and off of a circuit of the mower, the safety switch controls closing/breaking of the trigger switch, and the trigger lever respectively contacts with the trigger switch and the safety switch. The trigger lever with a pivoting point is capable of pivoting around the pivoting point, and the distance from a first contact point of the safety switch and the trigger lever to the pivoting point is longer than that from a second contact point of the trigger switch and the trigger lever to the pivoting point. The safety switch system is sensitive in trigger and labor-saving in operation.