The invention provides an instant messaging implementation method. The method comprises the following steps that: an on-site terminal acquires voice data, processes the acquired voice data and stores the processed data in a cloud platform; and a monitoring terminal receives voice uploaded from the on-site terminal through the cloud platform, decodes the received voice, and plays the decoded voice. Through adoption of the instant messaging implementation method provided by the invention, the network stability is enhanced in voice transmission; the call quality is improved; and a relatively high signal-to-noise ratio increment and a relatively good noise reduction effect are achieved.