The invention provides a network access power control method which is applied to network access control equipment. The method includes the following steps: obtaining a minimum transmission rate of a networking device currently connected to the network access control equipment; calculating minimum power values corresponding to the minimum transmission rate and the networking device and supported bythe network access control equipment; selecting a maximum value from the minimum power values as an output power value of the network access control equipment; and controlling the network access control equipment to reach the output power value. By controlling the power of the network access control equipment, in the case that the method makes each of networking devices reach the minimum transmission rate, the power of the network access control equipment is reduced as small as possible, thereby reducing energy consumed by a network device while communication requirements of the networking devices can be ensured. The invention provides a network access power control system, network access control computer equipment, and a storage medium.