The invention relates to an anti-trampling prewarning system for a people crowded region and an implementation method for the anti-trampling prewarning system. The prewarning system comprises a controller, a people density detection module and an alarming device, wherein the controller is connected with the people density detection module and the alarming device respectively, judges the people density gradient of the people crowded region according to a detection signal of the people density detection module and controls the alarming device according to the people density gradient; the people density detection module consists of an infrared sensor and a pressure sensor; the infrared sensor is mounted at a relatively flat opening part of the people crowded region; the pressure sensor is placed in an induction region of the infrared sensor. The anti-trampling prewarning system has the characteristics of simple structure, high reaction speed, low cost and good use effect, and can monitor the people density more accurately and effectively solve the problem of people trampling.