The invention provides a quinary-coefficient classification evaluating method for a tight oil reservoir. By deep research and analysis of reservoir stratum characteristics and seepage characteristics of the oil reservoir, a reservoir stratum evaluation parameter system is selected out, quantitative relations between all parameters and the oil reservoir development effect are established, a comprehensive quinary-coefficient evaluating model of the tight oil reservoir is built, reservoir stratum classification standards are determined, and the problem that the tight oil reservoir lacks a standard classification evaluating system is solved; meanwhile, corresponding oil reservoir development modes are established on the basis of the reservoir stratum characteristics, the seepage characteristics, crack characteristics and early development practice, and a certain guide effect is achieved for the efficient development of tight oil. The method has the advantages of being simple, practical and high in operability, and can be applied to classification evaluating studies on other tight oil reservoirs.