The invention discloses a sodium ion total battery with super long cycle life and excellent low temperature performance. A preparation method of the total battery taking Se/G as a negative electrode and Na3V2(PO4)2O2F as a positive electrode comprises the following steps: proportioning the positive electrode material Na3V2(PO4)2O2F and the negative electrode Se/G according to a certain mass ratio,mixing with graphitized carbon black and sodium carboxymethylcellulose for film preparation, and drying; inside a glove box in which the water content and the oxygen content are smaller than 1 ppm respectively, firstly after carrying out sodium pre-treatment on the negative electrode material for 0.5 to 24 h, preparing the positive electrode material and the negative electrode material into the total battery. A sodium ion total battery sample is obtained through packaging by using a 2032 button battery; after standing of the sealed sodium ion total battery sample for 10 h, under the current density of 0.4 A g<-1>, the specific capacity retention rate of the Se/G//Na3V2(PO4)2O2F total battery is more than 75% after 1000 times of circulation at the temperature of 25 to -25 DEG C, and the total battery has the excellent low temperature performance; at the high current density of 1 A g<-1>, the capacity retention rate is 92.6% after 10000 times of circulation at the temperature of 25 DEGC.