The invention relates to a protecting anti-collision device and especially relates to the protecting anti-collision device for a fire-fighting ground hydrant. The technical problem to be solved by the invention is to provide the protecting anti-collision device for the fire-fighting ground hydrant with excellent protection effect, high prompting strength and high practicability. In order to solve the technical problem, the protecting anti-collision device for the fire-fighting ground hydrant provided by the invention comprises a mounting tank, a first bearing block, a rotating rod, a reeling wheel, a gear, a pressing rod, a first bracing wire, a servo motor, a second bearing block, a screw rod, a nut and a rack, wherein the mounting tank is arranged at the ground bottom; the first bearing block is arranged in the middle of the top in the mounting tank; the rotating rod is arranged on the first bearing block; the reeling wheel is arranged on the middle part of the rotating rod; the first bracing wire is wound on the reeling wheel. The protecting anti-collision device for the fire-fighting ground hydrant can achieve excellent protection effect, high prompting strength and high practicability, is equipped with a protecting device, has a prompting function and is capable of protecting the ground hydrant while reminding people.