The invention relates to the technical field of power dispatching, and discloses a virtual power plant day-ahead accurate peak clipping method, system and device and a storage medium. When the day-ahead peak clipping demand is received, the real-time power supply path of each user is obtained according to the user account data, each real-time power supply path is inquired according to the identifier of the heavy overload device in the day-ahead peak clipping demand, and if the heavy overload device is inquired in the power supply device set corresponding to the real-time power supply path, the real-time power supply path of each user is inquired in the power supply device set corresponding to the real-time power supply path. Taking the user corresponding to the real-time power supply path as a target user, constructing a target user set, initiating an invitation to each target user in the target user set, determining a bid-winning user according to the feedback of each target user for the invitation, and issuing a day-ahead scheduling plan curve to each bid-winning user, and each bid-winning user carries out peak clipping feedback according to the day-ahead scheduling plan curve. According to the method, the accurate peak clipping requirement on a certain main transformer, a distribution transformer or a feeder line can be met, and the peak clipping accuracy is improved.