Electrophoresis tank with accurate and controllable liquid level

The invention discloses an electrophoresis tank with an accurate and controllable liquid level. The electrophoresis tank comprises an electrophoresis tank cover (2) and an electrophoresis tank body (4), wherein the electrophoresis tank cover is provided with an electrophoresis sample inlet (1), an electrode fixing port (3) and a replenishing liquid inlet (5), a liquid replenishing pump (9) is connected with a liquid storage tank (12) and the replenishing liquid inlet (5), an electrophoresis liquid circulating inlet (7) and an electrophoresis liquid circulating outlet (6) are formed in two sides of the electrophoresis tank body (4), a connecting pipeline (11) of the electrophoresis liquid circulating inlet (7) and the electrophoresis liquid circulating outlet (6) is provided with a circulating pump (10) for connection, and the electrophoresis liquid circulating inlet (7) is communicated with a liquid level monitor (8). Manual or automatic liquid supplementing is achieved by monitoring the liquid level height o