The invention belongs to the technical field of chemical analysis, and concretely relates to a uniform geological sample molten glass sheet produced through direct irradiation melting of a geological powder sample by adopting a wide-pulse with laser device (5-30 ms). A method for producing a green geological sample fast molten glass comprises the following steps: 1, placing the geological sample in a sample ring, and tabletting the geological sample in a sample press under 240 MPa for 5 min; and 2, placing the obtained pressed tablet on the sample bench of the wide-pulse with laser device, adjusting the sample bench, and carrying out irradiation melting on the geological sample by using laser for 60-160 ms in order to obtain the molten glass sheet. The method is green, fast and highly-efficient, and is very well suitable for LA-ICP-MS direct analysis determination of main and trace elements in the geological sample.