The utility model discloses an experimental overflow water tank of using of basket method is mainly divided and is formed by main water tank part branch, vice water tank part, main water tank part divides mainly including electronic balance, main water tank and main water tank cushion cap, the expansion tank part is main including expansion tank, expansion tank cushion cap and bolt cushion cap, main water tank and expansion tank pass through flexible rubber hose be connected constitute whole, but use this utility model to carry out basket method accurate control owner water tank water level when experimental, provide the constant temperature test environment, have characteristics such as experimental precision, convenient operation.