The invention provides an access control method and an access control system for a D2D communication link. The access control method comprises the steps of: judging a service type of data transmission of the current D2D communication link; establishing a mathematical model of connecting time of data transmission of the D2D communication link according to social information of the current D2D communication link when the service type of data transmission is a time sensitive type; calculating an access success rate of the current D2D communication link according to the mathematical model of connecting time; and comparing the access success rate of the current D2D communication link with a preset target success probability, and adding the current D2D communication link into an admission set conforming to access control if the access success rate of the current D2D communication link is greater than or equal to the preset target success probability. The access success rate of the D2D communication link is obtained by adopting the access control method, the service quality requirement of the D2D communication link is guaranteed, and the selection rate of the D2D communication link is increased.