我老公是新加坡公民，我们在中国领取结婚证并公证，请问我有必要再去新加坡多领一个结婚证吗

帮你查了一下新加坡婚姻注册局(ROM)的网站，关于你的情况，原文是：
19. What are the common things I need to know, as a Singaporean/PR who have married overseas?
1) The law does not require couples who contracted marriages overseas to re-register (includes "converting" or "endorsing" a foreign marriage certificate) with the Singapore ROM. The marriage certificate issued by the competent authority of the foreign country may be accepted as prima facie evidence of a marriage between the parties named in the certificate.
2) You may update agencies which you have dealings with about your new marital status. (Note advice by CPF Board : - Nomination made before your marriage will be revoked when you marry. For more information, please refer to http://mycpf.cpf.gov.sg/CPF/my-cpf/get-mar/GM.htm at www.cpf.gov.sg
3) If you wish to insert your husband's name into your identification documents, you may contact the Immigration & Checkpoints Authority.
4) If your spouse is a foreigner and you like to obtain permanent residence or citizenship for him/her, you may seek the advice of the Immigration & Checkpoints Authority.

根据上面说的，你们没有必要再注册，你们在中国注册的婚姻是受承认的。不过你老公需要在CPF(公积金局)以及其他的相关政府机构更新婚姻状况。

你带好护照签证结婚证直接到新加坡的supreme court（地址在city hall附近，你可以google一下）去公证一下，手续费30新币，有了这个公证就相当于在新加坡被认证了。

没有