Oil filter with double filtering structures

The utility model relates to an engine oil filter with a double filtering structure, which comprises a main body, a cover body is connected at an opening of the main body, and a main body oil inlet and a main body oil outlet which are respectively connected with an engine are arranged on the main body. A filter element assembly used for filtering engine oil entering the mounting cavity from the oil inlet of the main body and then enabling the engine oil to flow back into the engine from the oil outlet of the main body is mounted in the mounting cavity, the filter element assembly comprises an inner filter and a check valve arranged in the inner filter, and a first pipeline for communicating the check valve with the oil outlet of the main body is arranged on the main body; an inner filter is arranged in the installation cavity, an outer filter concentric with the inner filter is arranged in the installation cavity, a first filtering space is formed between the inner filter and the outer filter, and a second fi