The invention discloses an LORA data communication method based on TDMA, and belongs to the technical field of information. The method comprises the steps that a gateway sends first broadcast information to terminal nodes, the first broadcast information comprises time synchronization information, a data acquisition instruction, network node capacity and the number of first registered terminal nodes, and the gateway allocates time slots according to the network node capacity; the terminal node receives the first broadcast information sent by the gateway; the terminal node determines time slotinformation of the first data transmission window according to the stored time slot information; the terminal node sends data information to the gateway according to the data acquisition instruction and the time slot information of the first data transmission window; the problem that the transmission efficiency is sharply reduced when the number of the terminal nodes is increased due to the fact that a random mode is adopted for transmission and conflicts are generated among the terminal nodes is solved. The effect that the terminal nodes do not conflict at all in the meter reading time slot is achieved, and the accuracy and efficiency of data transmission are improved.