In view of the high complexity of the current high-precision load identification algorithm, which is difficult to achieve low-cost appliances monitoring devices, and the problem that it is difficult to achieve high-precision appliances identification only based on steady-state characteristics, designs of a low-cost appliances analyzing and monitoring device based on CUSUM and weighted Euclidean distance is proposed. The device collects the electrical parameter characteristics of the working state of the electrical appliance through the sampling circuit, establishes a three-dimensional electrical feature library based on the steady-state active power, reactive power and transient overshoot power amplitude, uses the CUSUM control chart to realize the detection of appliance switching event with the overshoot amplitude detection function, and completes the identification of appliance working state through the weighted European distance model. The experimental results show that the average appliance identification accuracy of the monitoring device designed in this paper is 97.3%, which verifies the feasibility of the design scheme.