The invention discloses an automobile radiator grille lock mechanism. The automobile radiator grille lock mechanism comprises a lock body seat plate, a pawl tension spring, a ratchet shaft, a pawl shaft, a ratchet wheel, a pawl, a fixing shaft and two cover plates; the ratchet shaft and the pawl shaft are riveted to the lock body seat plate, the ratchet wheel and the ratchet shaft are riveted, andthe pawl and the pawl shaft are riveted; one end of the pawl tension spring is hooked to the ratchet wheel, and the other end of the pawl tension spring is hooked to the pawl; the two cover plates are connected with the ratchet wheel and the pawl; and the fixing shaft is installed on the lock body seat plate. The automobile radiator grille lock mechanism is simple in structure, high in meshing strength, high in universality and easy to adjust.