Nearly 100 years have passed since the Dirac charge quantization model was established, but unfortunately one of the most important factors, magnetic monopoles, has not yet been detected. This paper attempts to solve this problem using the theory of virtual spacetime or imaginary spacetime. By treating the electric field rotation of electrons and protons as an infinitely long solenoid, and then calculating the magnitude of the magnetic charge carried by the magnetic monopole from the known parameters of the electrons and protons. In this way, it can be seen whether such a result can meet the requirements of charge quantization. The calculation results show that if the magnetic monopole is confirmed in the presence of virtual spacetime, the conditions for quantization of the charge can be automatically satisfied. This proves that the singular strings connecting electrons and protons cannot be observed. The automatic satisfaction of the charge quantization condition means that there can be no singular strings in the physical world that do not meet the charge quantization conditions.