si 1 6 of mn 0 6 of cr 0 45 of ni 0 6 of mo 0 025 of p 0 015 of s and the balance of fe the method for casting the integral excavator bucket from the cast steel is characterized by comprising the following steps 1 putting cast steel components into a melting furnace and melting at 1600 u00b0 c such that a charging material is molten stably and uniformly to reach a casting requirement 2 carrying out modification treatment before furnace on molten steel adding rare earth to the melting furnace before casting and carrying out modification treatment on molten steel at 1600 u00b0 c and then putting a grain refiner to further modify the molten steel to obtain modified molten steel 3 manufacturing models and a template manufacturing the bottom plate provided with an aspirating chamber and an upper model and a lower model consistent with the excavator bucket wherein air vents are formed in edges dead angles internal corners and deep grooves of the upper model and the lower model the models are fixed on the bottom plate and the air vents are directly communicated with the aspirating chamber of the bottom plate the aspirating chamber of the bottom plate has a function of aspirating air from the models such that the models are at a negative pressure state 4 coating heating and vacuumizing heating an eva plastic film having a size equal to that of the models of the excavator bucket to be softened to obtain a softened film and starting a vacuumizing device such that the softened film is tightly clung to the upper model and the lower model in.