The invention discloses an automotive tail lamp automotive alarming device. The automotive tail lamp automotive alarming device comprises a monitoring table, a tail lamp shell, an automotive antenna, an automotive remote controller and an automotive electronic control unit (ECU), wherein an automotive tail lamp, a micro-wave sensor and a high-definition camera are mounted in the tail lamp shell in a threaded manner; the micro-wave sensor and the high-definition camera are symmetrically distributed on two sides of the automotive tail lamp; a line through hole which penetrates through the tail lamp shell is formed in the tail end of the tail lamp shell; a sealing cover is fixed on the outer side of the tail lamp shell in a threaded manner; concave surfaces are respectively arranged at the top and the bottom of the monitoring table; and an alarming lamp is fixed at the top end of the monitoring table in a threaded manner. In a running process, the running speed of vehicles at the rear is accurately detected, when an automobile backs up, situations at the position of an automobile tail can be observed through the high-definition camera and the micro-wave sensor, meanwhile, pedestrians and objects can further be detected, a three-dimensional stereogram can be displayed in a display screen under the control of the controller, and a driver can directly and quickly know situations nearby an automobile body.