The invention provides a well bottom gas-liquid separator, which comprises a tubular part (21), a gas-liquid separation chamber (2), a through shaft motor (16) and a compressor (7), wherein a tube wall defining an air inlet (1) and an air outlet (81) is arranged around the tubular part (21), the air inlet (1) and the air outlet (81) have a certain axial distance, the gas-liquid separation chamber (2), the through shaft motor (16) and the compressor (7) are sequentially arranged in the tubular part (21) arranged between the air inlet and the air outlet on the same axial line, a liquid collecting convex plate (82) provided with a projected hole seals and covers the air outlet (81) formed in the top of the tubular part (21), a cavity formed between the tubular part (21) and an outer sleeve (11) forms a gravity separation part (20), the top of the gravity separation part (20) is sealed, an air inlet hole (13) is formed in a wall of the tubular part (21) corresponding to the compressor (7), a plurality of exhaust/liquid discharge holes (4) are formed in the tubular part (21) provided with the gas-liquid separation chamber (2) arranged in the middle part of the gravity separation part (20), a liquid collecting groove (5) is formed by a liquid blocking plate (15) and the outer sleeve (11) at the end, near the air inlet (1), of the gravity separation part (20), and a condensed liquid recovery pool (12) is positioned on the top of the gravity separation part (20).