Household hot water supply device with good protection effect

The invention relates to a household hot water supply device with a good protection effect. The household hot water supply device comprises a bottom plate, two water tanks and at least two heat collecting pipes, wherein the water tanks are fixed on the bottom plate; the two water tanks are arranged in a right opposite mode; a gap is formed between the two water tanks; the heat collecting pipes areparallel to the bottom plate; the distances between the heat collecting pipes and the bottom plate are equal; the heat collecting pipes are uniformly arranged between the two water tanks; the two ends of the heat collecting pipes are fixed to and communicate with the two water tanks respectively; auxiliary mechanisms are arranged on the heat collecting pipes respectively; sealing mechanisms are arranged in the two water tanks respectively; each auxiliary mechanism comprises an arc-shaped plate and a rotating assembly; each sealing mechanism comprises at least two sealing assemblies; and the sealing assemblies are in