Provided is a floor tile slip warning device with humidity alarm. The floor tile slip warning device comprises a floor tile and skirting lines. The periphery of the floor tile is provided with the skirting lines which are provided with multiple warning lamps. The right side of the skirting lines is provided with a controller, a warning loudspeaker, a button switch and a battery. The floor tile is provided with multiple humidity sensors. The humidity sensors are electrically connected with the controller via underground conductive wires. The warning lamps are electrically connected with the controller via wall concealed conductive wires. The controller is electrically connected with the warning loudspeaker, the button switch and the battery. One warning device is installed on the skirting line board of the floor tile. The humidity sensors transmit signals to the controller if there is water on the floor tile. The controller sends the signals, the warning lamps light up, and the warning loudspeaker generates sound to prompt students of "caution slippery" so as to be quite safe.