The invention provides an urban public transportation passenger flow congestion index calculation method based on subjective perceptions of passengers, relating to the field of traffic engineering. The method is based on a 'limitation extension' thought, the subjective perceptions of the passengers on travel time and space congestion are systematacially quantized, are more close to physiological and psychological states of the passengers on a public transportation service and can be taken as one important index for measuring public transportation service level in future, quantizable public transportation operation and service performance dynamic index support are provided for an urban transportation industrial management unit and a public transportation monitoring command organization, anddecision support is provided for industry service monitoring, developing a bus operation service improving strategy and evaluating a public transportation investment effect.