The embodiment of the invention provides a service deployment and task scheduling method and device based on edge computing. The method comprises the steps of responding to a service request when a first calculation cost of a target service in a first node server is not greater than a preset threshold; if the first calculation cost is greater than the preset threshold, determining a second node server; and sending the service request to the second node server, so that the second node server responds to the service request according to a pre-deployed computing unit. According to the scheme, thedevice comprises a base, the calculation cost of the first node server and the calculation cost of the alternative node server for the service request are compared; a calculation unit is selected anddeployed; and the node server of the service request can be efficiently and timely processed, so that the condition that the node server is overloaded and the service request cannot be timely processed after the service request is migrated to a certain node server is avoided, the communication delay can be effectively reduced, the network load can be balanced, and the network service quality canbe improved.