Magnon possess spin without electric charge, thus magnonic device can avoid the high energy consumption caused by Joule heat in electronic devices. Microwave antenna is one of the simple and effective means to excite spin waves. However, for a given microwave antenna, it can only excite spin waves in a very narrow frequency range, and there is a obvious excitation forbidden band. Therefore, the efficient wideband excitation of spin waves remains a key issue in magnonic devices. This article proposes a method for achieving wideband and high-efficiency excitation of spin waves with spin-transfer torques (STT) assistance. Theoretical analysis and simulation results of micro-magnetism show that the excitation efficiency of spin waves is highly dependent on the width of excitation antenna and excitation frequency, and the spin waves can only be excited efficiently in a narrow frequency range. The STT is introduced and the current density is modulated, which can effectively excite the spin waves that is difficult to excite before, and realize the efficient excitation of spin waves in a wide frequency range. We use the wave interference theory to explain these phenomena, and the theoretical analysis results are highly consistent with the simulation results. This method of improving the excitation efficiency and bandwidth of spin waves is not only suitable for microstrip antenna excitation, but also for some other excitation methods. At the same time, the study also found that STT can lead to asymmetric excitation of spin waves. The STT not only has a positive significance in the excitation of spin waves, but also has certain reference value for interference regulation, coherent spin waves generation, and unidirectional transmission of spin waves. This method is more reliable than those that directly use multi-antenna or multi-pulse to excite coherent spin waves, and the manipulation of phase difference is simpler and more accurate, and it is more efficient and adaptable than some unidirectional transmission using non-reciprocity. These results have important reference significance for the excitation and propagation control of spin waves, and provide a new idea for the design of new magnonic devices.