The invention relates to the field of dental repair technology, in particular to an oral implant with a conical surface and a rectangular key structure. The oral implant can be implanted in an alveolar bone in a surgery. The oral implant comprises an implant, and a base and a fastening bolt which are matched with the implant. The oral implant is characterized in that the implant consists of a cylindrical upper section part and a conical lower section part, wherein a conical hole is formed at the upper end of the interior of the implant, a cylindrical hole is formed at the middle section of the interior of the implant, a fastening screw hole is formed at the lower end of the interior of the implant, a cylindrical surface and the conical surface which are matched with the cylindrical hole and the conical hole are formed on the lower part of the base, and a key slot and a rectangular key which are matched with each other are formed on the cylindrical hole and the cylindrical surface respectively. The oral implant has the advantages of simple operation, short operation time, good initial stability after operation, good sealing property, high reliability, good base rotation resistance and platform conversion structure, bone absorption inhibition or removal and the like.