Atrial fibrillation (AF) is common in hypertension, and electrophysiological remodelling may contribute to the early stage of the disease. This study aimed to develop electrocardiography (ECG) prediction models on new-onset AF (NAF) in early-onset hypertension (e-HTN). This matched case-control study included primary hypertension patients with onset <5 years defined as e-HTN and without documented AF. Developed NAF was the risk group and non-developed NAF was control group with 1:2 ratio. Group was matched according to age, gender, follow-up time, and duration of hypertension. Parameters of ECG and echocardiography between the groups at the baseline and end of follow-up will be compared. A total of 348 e-HTN with 116 developed NAF during follow-up (60.2 ± 14.5 months) were included. At baseline ECG, duration of QRS (100.84 ms ± 15.69 ms vs 94.80 ms ± 15.68 ms), Pmax (106.75 ms ± 7.93 ms vs 101.77 ms ± 6.78 ms), Pmin (70.24 ms ± 5.59 ms vs 68.17 ms ± 5.61 ms), P-wave dispersion (PD) (36.50 ms ± 5.25 ms vs 33.60 ms ± 5.46 ms), P-wave Peak Time (PWPT) II (62.01 ms ± 3.92 ms vs 54.29 ms ± 6.73 ms), and PWPT V1 (55.31 ms ± 2.89 ms vs 51.24 ms ± 4.05 ms) were significantly higher in developed NAF (all P-value < 0.05). LVMI was also significantly higher in bivariate analysis, but only Pmax, Pmin, PD, PWPT, non-RAAS inhibitor, and uncontrolled hypertension were independently associated with developed NAF. Baseline PWPT II with cut-off ≥57.9 ms and PD ≥ 35.5 ms has high sensitivity and specificity on NAF prediction. In conclusion, baseline PWPT and PD are potential electrophysiological parameters for predicting NAF in e-HTN.