The invention pertaining to the field of super-heavy steel plates rolling technique provides a low-alloy high-strength super-heavy steel plate at a 100mm400MPa level and a method for producing the same. The low-alloy high-strength super-heavy steel plate comprises the following components by weight percentage: C of 0.14-0.18%, Si of 0.35-0.40%, Mn of 1.45-1.60%, Nb of 0.025-0.040, V of 0.030-0.090, Ti of 0.010-0.020, P<0.01%, S<0.008% and Fe of the rest.The rolling technique comprises setting a heating-up temperature at 1230-1250 DEG C, a tapping temperature at 1200-1230 DEG C, adopting two stages of an austenite recrystallization zone and an austenite non-recrystallization zone for controlling the rolling and adopting a multi-block loop rolling mode. The final rolling temperature of the austenite recrystallization zone rolling is set as 1020-990 DEG C, middle blanks having a thickness of 1.7-2.0 times of that of the finished products are roughly rolled, the reduction in each pass is 12-15%; after the rolling, a laminar cooling process is performed with a cooling rate of 10-8 DEC C/s. The invention has advantages that the low-alloy high-strength super-heavy steel plate has favorable synthetic mechanical performances, a thermal treatment process is omitted, additive amount of alloy elements is reduced, the energy is saved greatly and the production cost is also reduced.