A mobile communication network switching method, device, UE and storage medium are provided. The method includes that: a measurement configuration message sent by a base station is received, candidate frequency points are measured to obtain a signal strength parameter of each candidate frequency point, and at least one candidate frequency point meeting a switching condition is determined; a signal strength parameter of a mobile communication signal of a current frequency point is monitored when in a call state; when the signal strength parameter meets a preset condition, a signal strength parameter of the at least one candidate frequency point meeting the switching condition is increased in the same trend, and report information of the at least one candidate frequency point is reported to the base station; and a switching instruction fed back by the base station is received, and a network switching operation is performed according to the switching instruction.