The invention relates to a portable tablet type engineering geological surveying and mapping working method based on windows. The engineering geological surveying and mapping working method comprises the following steps: collecting and storing coordinate information of a measurement control point of an outdoor working area; receiving longitude and latitude data and elevation data of the measurement control point, wherein the data are actually measured in site by a recorder through a GPS (Global Position System) satellite; converting the longitude and latitude data and the elevation data into rectangular coordinates; analyzing the converted rectangular coordinates of the measurement control point and the collected coordinate information, and carrying out error correction; opening a topographic map of the working area in an ACAD, starting a GPS, tracking a walking route, and automatically drawing a material draw; automatically loading a shadowgraph as a background of an engineering geological map; sketching geological phenomena in site, and completing digital mapping of outdoor engineering geological surveying and mapping; photographing and comprehensively describing a geological point, and recording various geological information according to a standard format. The method provided by the invention has the advantages of being simple and convenient to operate and accurate in positioning; the data are prevented from being repeatedly recorded; furthermore, the reciprocation time and frequency between a surveying and mapping site and a data center can be saved; all the work can be completed in an outdoor geological site; the working efficiency of the surveying and the mapping is high.