The invention relates to a method for acquiring steady-state temperature rise of a cable group considering thermal conductivity and heat dissipation coefficient, which comprises the following steps of1) according to the cross-sectional structure of the cable group, establishing a steady-state temperature rise calculation model of the cable group; 2) acquiring a known steady-state temperature riseof the cable under a plurality of working conditions, and acquiring a corresponding steady-state temperature rise transfer matrix of the cable group under different working conditions; 3) obtaining asteady-state temperature rise transfer matrix A 'of that cable group after the change of the soil thermal conductivity and the convective heat dissipation coefficient are taken into account aft the fitting by the data fitting; 4) obtaining that actual steady state temperature rise transfer matrix of the cable group according to the soil thermal conductivity and convection heat dissipation coefficient measure in the actual measurement, and obtaining the actual steady state temperature rise of the cable group by combining the calculation of the field cable heat flow. Compared with the prior art, the method of the invention has the advantages of being convenient, rapid and accurate, considering the thermal conductivity and the heat dissipation condition, and the like.