The utility model discloses a manual formula liquid tank sampler, include sample bottle and the liquid fetching device who communicates with the sample bottle, liquid fetching device is including setting up pull rod and the one -way sealing cushion in a closed shell and setting up at outside handle, rubber tube and the weight of casing, the external diameter and the inner diameter of the shell of one -way sealing cushion suit and separate the casing for last movable chamber and lower vacuum cavity, pull rod one end and one -way sealing cushion center is fixed, the other end stretches out the casing top and is connected with the handle and fixes, the sample bottle includes the bottle and seals the plug at the bottleneck, vacuum cavity and the inside intercommunication that forms of sample bottle under the casing to be provided with a stop valve on the connecting pipe, the inside intercommunication that forms of weight, other end sample bottle is connected to rubber tube one end, this manual formula liquid tank sampler convenient operation, portable, reduction workman's intensity of labour, low price, especially adapted field work's requirement is processed to equipment.