查了大使馆网站，应该是不需要办过境签证的，大家帮助看下，问题是最后说明留了个尾巴1What passport do you have?ChinaChange this answer2What are you coming to the UK to do?Transit (on your way to somewhere else)Change this answer3Will you pass through UK Border Control?YesChange this answerYou’ll need a visa to pass through the UK in transitYou should apply for a Visitor in Transit visa if you arrive on a flight and will pass through immigration control before you leave the UK.Transiting without a visaYou might be eligible for the ‘transit without visa concession’ if:you arrive and depart by airhave a confirmed onward flight which leaves within 24 hourshave the right documents for your destination (eg a visa for that country)One of the following must also apply:you’re travelling to Australia, Canada, New Zealand or the USA and have a valid visa for that countryyou’re travelling from Australia, Canada, New Zealand or the USA and it’s less than 6 months since you last entered that country with a valid entry visayou have a valid US permanent residence card issued on or after 21 April 1998 (or an I-797 extension letter issued by the Bureau of Citizenship if it’s expired)you have a valid Canadian permanent resident card issued on or after 28 June 2002you have a valid uniform format category D visa for entry to a state in the European Economic Area (EEA)you have a valid uniform format residence permit issued by an EEA stateThe ‘transit without visa concession’ is decided by the immigration officer at the border. You won’t be allowed to transit if they decide you need a visa, so you might want to apply for a transit visa before you travel.

如果你有美国绿卡，可以不要转机签证；如果没有还是得去办一个，否则有可能连登机牌都拿不到直接被航空公司拒了。

要。世界上仅有几个转机不出机场也要办证的奇葩国家。

要。世界上仅有几个转机不出机场也要办证的奇葩国家。

我从这里预订的签证服务 https://z.qyer.com/deal/108940/

【签证类型】：美国个人旅游签证
【入境次数】：多次
【停留时间】：180天（具体海关批）
【有 效 期】：10年有效
【办理时长】：12-20个工作日（面试后8-10工作日）
【是否面试】：是
【送签领区】：广州领区/上海领区/北京领区/成都领区
【受理范围】：不分领区，全国各省份颁发护照就近办理。