The present disclosure relates to a method and system for assessing quality of incremental heterogeneous data by a data quality assessing system. The data quality assessing system determines an incremental heterogeneous data from at least one data source, obtains details associated with the incremental heterogeneous data from the at least one data source, identifies type of the incremental heterogeneous data based on the details and pattern templates, selects one or more data quality tests from a plurality of data quality tests for the incremental heterogeneous data based on the identified type of the incremental heterogeneous data and determines a score for the incremental heterogeneous data based on the one or more data quality tests and user defined parameters to assess quality of heterogeneous incremental data.