An intravenous drip monitoring method comprising: receiving a monitoring initializing signal; measuring a current loaded weight by a weight-measuring module; assigning the loaded weight respectively as an initial weight and a current weight to store in a storage module when the current loaded weight is smaller than an empty weight, or generating a non-empty alert signal to activate a flow to terminate the monitoring when the loaded weight is larger than the empty weight; calculating an alert weight based on the current weight stored in the storage module to determine whether the alert weight is larger than a predetermined minimum alert weight, wherein the alert weight is set to be equal to the predetermined minimum alert weight when the alert weight is not larger than the predetermined minimum alert weight, and the alert weight is set to be equal to the alert weight when the alert weight is larger than the predetermined minimum alert weight; measuring a current loaded weight by the weight-measuring module and assigning the loaded weight as a new current weight to renew the current weight stored in the storage module; changing to a monitoring status when the renewed current weight is not smaller than the alert weight and performing the step; changing to an alert status when the renewed current weight is smaller than the alert weight and is not smaller than the empty weight to control an alert module to generate an alert signal until to remove an intravenous drip bag on the weight-measuring module and to perform step or to activate the flow to terminate the monitoring; changing to an empty status when the renewed current weight is smaller than the empty weight and the renewed current weight is smaller than the alert weight to perform a reset to zero and a zero offset calibration on the weight-measuring module; measuring a current loaded weight by the weight-measuring module when an intravenous drip bag having the infusion loaded on the weight-measuring module; and assigning the loaded weight respectively as a new initial weight and a new current weight to renew the initial weight and the current weight stored in the storage module, and performing the step. receiving a monitoring initializing signal; measuring a current loaded weight by a weight-measuring module; assigning the loaded weight respectively as an initial weight and a current weight to store in a storage module when the current loaded weight is smaller than an empty weight, or generating a non-empty alert signal to activate a flow to terminate the monitoring when the loaded weight is larger than the empty weight; calculating an alert weight based on the current weight stored in the storage module to determine whether the alert weight is larger than a predetermined minimum alert weight, wherein the alert weight is set to be equal to the predetermined minimum alert weight when the alert weight is not larger than the predetermined minimum alert weight, and the alert weight is set to be equal to the alert weight when the alert weight is larger than the predetermined minimum alert weight; measuring a current loaded weight by the weight-measuring module and assigning the loaded weight as a new current weight to renew the current weight stored in the storage module; changing to a monitoring status when the renewed current weight is not smaller than the alert weight and performing the step; changing to an alert status when the renewed current weight is smaller than the alert weight and is not smaller than the empty weight to control an alert module to generate an alert signal until to remove an intravenous drip bag on the weight-measuring module and to perform step or to activate the flow to terminate the monitoring; changing to an empty status when the renewed current weight is smaller than the empty weight and the renewed current weight is smaller than the alert weight to perform a reset to zero and a zero offset calibration on the weight-measuring module; measuring a current loaded weight by the weight-measuring module when an intravenous drip bag having the infusion loaded on the weight-measuring module; and assigning the loaded weight respectively as a new initial weight and a new current weight to renew the initial weight and the current weight stored in the storage module, and performing the step.