The present invention relates to a mobile sterilizer capable of setting a sterilization time by using an automatic volume calculation, more specifically, to a sterilizer which can automatically determine a sterilization time according to a size of a place where sterilization is desired, The present invention relates to a mobile sterilizer capable of setting a sterilization time using an automatic volume calculation capable of solving a problem. The mobile type sterilizer capable of setting the sterilization time using the automatic volume calculation according to the present invention comprises a plurality of sterilizing lamps, a moving wheel is mounted at the lower end, a moving handle is mounted at the upper end, a hemispherical cap 10 is placed on the upper side, And a sterilizer moving body (100) having a predetermined size, wherein the moving sterilizer comprises: A plurality of ultrasonic sensor units 200 formed on the hemispherical cap to generate ultrasonic waves to sense X-axis, Y-axis, and Z-axis distances； A remote controller (400) for remotely controlling the sterilizer moving body and providing sterilizing time information provided by the control means to a screen； An XYZ axis distance calculating unit 310 for obtaining a signal sensed by the ultrasonic sensor unit and calculating an X axis, a Y axis, and a Z axis distance； A volume calculator 320 for extracting the volume of the sterilizer moving body stored in the memory unit and calculating the volume of the sterilization place with reference to the calculated distance, A sterilization time extracting unit 330 for acquiring the volume of the sterilization place and extracting the sterilization time information by volume stored in the memory unit, A sterilization time information transmitter 340 for providing the extracted sterilization time information to the remote controller, A memory unit 350 including volumetric information of the sterilizing machine moving body, sterilization time information by
