The utility model discloses an inclinometer for a seabed base, which is characterized in that: the inclinometer comprises a power supply data line, a fastening end cover, a pressing cover, sealing packing, an inclinometer top cover, a fastener, a sealing ring, an inclinometer sensor and an inclinometer shell; the inclinometer top cover and the inclinometer shell are fastened and connected by the fastener to form an inclinometer sealing chamber; the inclinometer sensor is arranged in the inclinometer sealing chamber; the sealing ring is arranged between the inclinometer top cover and the inclinometer shell; a through hole is arranged in the center of the inclinometer top cover; the sealing packing is arranged in the through hole; the pressing cover and the fastening end cover are arranged at the top of the sealing packing; the power supply data line connected with the inclinometer sensor sequentially passes through the sealing packing, the pressing cover and the fastening end cover through the through hole; and the fastening end cover is connected with the inclinometer top cover through screw threads. The inclinometer for the seabed base has the advantages that the inclinometer has simple structure, good sealing performance and high system security, is scientific and reasonable, and is convenient to install and easy to assemble and disassemble. When the seabed base is distributed, the accuracy of the data acquired by ADCP (advanced display core processor) is ensured.