The invention discloses a data grading organization method based on longitude and latitude grid. The method comprises the following steps: carrying out 5 layers 15 grades partitioning on an Earth surface according to latitude and longitude, wherein each block is corresponding to an image of 1000 elements*1000 elements, each layer has three grades, the grades in the layer are arranged in order according to a size proportion of 5:2.5:1, difference between a layer with an adjacent layer is 10 times, block sizes in the first layer are 50 degrees*50 degrees, 25 degrees*25 degrees and 10 degrees*10 degrees in order, block sizes in the second layer are 5 degrees*5 degrees, 2.5 degrees*2.5 degrees, and 1 degree*1 degree in order, and so on. According to the data grading organization method based on longitude and latitude grid, a 5 layers 15 grades partitioning mode is carried out on the Earth surface, a size of each block of each grade is simple limited floating-point number, position determination is carried out according to a simplified latitude and longitude coordinate, organization and management of data are facilitated, when a plurality of blocks of pictures are displayed on a spherical surface, seamless splicing can be ensured, a grading partitioning mode of the present invention matches with a map scale well, and map output requirements of different scales are satisfied.