Most cluster schemes select cluster head (CH) randomly without considering load balancing and security in Wireless Sensor Networks (WSNs). Our research on relevant literature shows that the existing authentication schemes do not fully consider the load balancing of CHs, while the load balancing schemes ignore the security authentication of CHs. Therefore, this paper effectively combines load balancing and security verification, and proposes a secure load balancing and authentication scheme (SLEB) based on Clustered Wireless Sensor networks. SLEB not only effectively maintains the energy balance of the whole network, but also successfully improves packet forwarding rate and prolongs the network lifetime. The simulation shows that SLEB is energy-saving, safe and sustainable compared with other similar schemes.