What are the documents required for HK travel visa at China embassy in colombo. Application is available where?

You can submit your application to Chinese embassy in Colombo or the HK Immigration Department directly. If the embassy issues it, you can get it in four days. If the immigration department issues it, you will wai for around one month. The documents include your passport, filled application form (ID1003A), a recent color photo (48X33mm), financial statement, such as your bank deposit proof, employment proof and transport arrangement (flight schedules for example).