The invention discloses a scheduling system and a decision-making method for service deployment and migration in a mobile edge calculation environment. According to the method, decision calculation ofservice scheduling is carried out on a user service request by taking a service quality guarantee of user mobile handover as a target, and an optimization scheme of service deployment and migration is generated, wherein the service deployment and migration scheme is expressed as a deployment matrix; performing iterative optimization on a plurality of pre-defined deployment matrixes by decision calculation; wherein the optimization target comprises signal propagation delay from a user to a service, a resource occupancy rate and migration time of the service, and the optimization step comprisesmatrix scoring, weighted random selection and reconstruction according to scores, inter-matrix row crossing and single matrix element displacement, and performing constraint test on a result, whereinthe completion condition of the decision calculation is that the number of iterations reaches a preset value, or the number of continuous iterations which do not meet the constraint reaches a presetvalue. The invention provides an efficient service scheduling method for user handover of mobile edge calculation.