Coal mine tunnel floor heave monitoring and alarming device

The utility model discloses a coal mine tunnel floor heave monitoring and alarming device, which relates to the field of tunnel floor heave monitoring and alarming devices and comprises a circuit main circuit and a branch circuit, the circuit main circuit comprises a switch, a power supply and a slide rheostat, and the switch, the power supply and the slide rheostat form a series circuit through leads. The branch comprises a current alarm and a piezoresistor which are connected in parallel at the head section and the tail section of the slide rheostat through wires, the current alarm and the piezoresistor are connected in series, and the upper end of the piezoresistor is connected with an upper bearing plate. According to the utility model, when the bottom heave of the roadway bottom plate occurs, the bottom heave condition of the roadway bottom plate can be accurately monitored according to the alarm condition of the current alarms in the branches, and furthermore, the bottom heave quantity of the roadway bo