The invention discloses an electronic partogram system and a parameter calculating method based on a magnetic field tracing and positioning technology. The electronic partogram system comprises a magnetic field tracing and positioning module, an ultrasonic image module, a fetal heart rate and uterus shrink pressure module and an electronic partogram workstation. The magnetic field tracing and positioning module comprises a magnetic field generation device for generating a magnetic field and a magnetic induction sensor. According to the invention, through monitoring parameters such as a fetal head position, a fetal head direction, cervical dilatation, a fetal heart rate, uterus shrink pressure in a delivery process, an electronic partogram can be full-automatically or semi-automatically generated on a measuring time point, so that a doctor can dynamically monitor the delivery process through the electronic partogram. Simultaneously, due to the utilization of a full-automatic parameter calculating operation mode and a semi-automatic parameter calculating operation mode, through monitoring fetal head parameters and pelvis parameters, pelvic disproportion can be forecasted on the measuring time point; and through monitoring the fetal heart rate and the uterus shrink pressure of a mother/ a fetus, multi-parameter monitoring is realized.