The invention discloses a self-locking anti-drop elevator, which belongs to the technical field of geological drilling. It has the characteristics of self-locking of the elevator and preventing the oil pipe from falling off. It mainly includes the elevator body, the lifting lugs are installed symmetrically on both sides of the elevator body, the lifting lugs are provided with horizontal grooves, the lifting lugs are provided with vertical grooves, and the pin rods are fixed in the vertical grooves, and the pin rods are fitted with limited Position ring, the lifting lug is provided with an inner groove on the upper side of the horizontal groove, the inner groove is arranged on one side of the vertical groove, the inner groove is provided with a window on the upper side of the pin rod, and a loading block is installed in the inner groove, and the loading block includes a bottom plate , top plate and side plate, the inner side of the side plate is fixedly connected to the elastic piece, and the elastic piece is fixedly connected to the baffle plate. The bottom surface of the baffle plate is inclined and is between the bottom plate and the top plate. The loading block and the second vertical connecting rod, the top surface of the second vertical connecting rod is an inclined plane; an anti-falling device is also included, and the anti-falling device includes a telescopic cylinder, a PLC controller, a mobile power supply and a displacement sensor.