The invention relates to the technical field of ocean petroleum engineering and concretely discloses a floor drain device of an ocean petroleum platform. The floor drain device comprises a floor drainbody. Grates are arranged on the floor drain body. The lower part of the floor drain body is provided with a sewer pipe. A filter net is arranged between the floor drain body and the grates. The filter net comprises an outer-layer filter net and an inner-layer filter net. Each filter hole of the inner-layer filter net is a (1.5-2) mm*(10-20) cm square hole. Additionally, short sides of two adjacent rows of square holes are arranged in a staggered manner. Each filter hole of the outer-layer filter net is a square hole with the hole diameter of 1-1.5mm. A gap is kept between the outer-layer filter net and the inner-layer filter net so that a filter cavity is formed. A pipe cap covers the sewer pipe and is provided with a lifting handle. The floor drain device of the ocean petroleum platformhas following advantages: cleaning efficiency is increased; safety hazards due to replacement of a blocked floor drain pipeline are reduced; and long-period safe operation of a platform pipeline system is ensured.