Ultra-Wideband (UWB) technology is considered the most suitable for indoor wireless location technology. In order to achieve the location of the nodes in UWB-based Internet of Things (IoT) and the simulations of the location algorithms, Matlab was used in the article to simulate the PPM-TH-UWB signal in IEEE802.15.4a channel model, which included the emission, delay, attenuation, adding noise, channel impulse response, correlation receiver and location of the nodes. The proposed methods can realize the algorithm simulations for positioning, testing and evaluation of wireless location in the absence of the UWB sending and receiving device.