The invention discloses biological teaching slide glass, comprising a base located under a microscope object lens; cover glass is arranged between the base and the microscope object lens; the top of the base is provided with an object groove; the object groove is internally provided with a crash pad; the crash pad is provided with an object piece; the cover glass is located on the object piece; the periphery of the crash pad is provided with support bars; the bottom inner wall of the place groove is in slide connection with the bottom outer wall of the support bars; the top parts of the support bars are in fixed connection with a baffle plate; the bottom of the baffle plate and the top of the cover glass are located on a same horizontal plane; the top of the baffle plate is provided with an object channel; the periphery of the object channel is provided with a circular lead; the lead is located in the baffle plate; one side of the baffle plate is provided with an alarm device; the alarm device is in connection with the lead through an electric connection line. The biological teaching slide glass can not be damaged by pressing of a microscope object lens, and prevent a sample from being damaged.