A wearable touch device, comprising: a carrier that is wearable; a projecting unit adapted to project to a touch surface capable of being touched by a touch end; a monitoring unit adapted to monitor contact information between the touch end and the touch surface and send the contact information to a processing unit; and the processing unit adapted to process the contact information so as to judge whether the touch end effectively contacts the touch surface, wherein the touch end is a human finger, the touch surface capable of being touched by the touch end is any other human body region capable of being touched by the human finger, the contact information includes contact strength information, the monitoring unit comprises a pressure monitoring unit or a vibration monitoring unit, the pressure monitoring unit or the vibration monitoring unit is adapted to monitor the contact strength information produced between the touch end and the touch surface and send the contact strength information to the processing unit, and wherein the processing unit comprises a comparison module and a judging module, and a contact strength threshold information is pre-stored in the processing unit; wherein the comparison module is adapted to compare the contact strength information with the contact strength threshold information and to send a comparison result to the judging module, and the judging module is adapted to judge whether the contact strength information is effective in accordance with the comparison result, wherein the processing unit is further adapted to judge whether the touch end effectively contacts the touch surface by judging whether there is a human body closing current formed between the touch end and the touch surface and whether the contact strength information is effective, when it is judged that there is a human body closing current formed between the touch end and the touch surface and the contact strength information is effective, it is judged that the touch end effectively contacts the touch surface; when it is judged that there is a human body closing current formed between the touch end and the touch surface but the contact strength information is ineffective, or when it is judged that there is no human body closing current formed between the touch end and the touch surface, it is judged that the touch end does not effectively contact the touch surface, wherein the contact strength information is effective in a case where the contact strength information is larger than the contact strength threshold information, and the contact strength information is ineffective in a case where the contact strength information is equal to or smaller than the contact strength threshold information. a carrier that is wearable; a projecting unit adapted to project to a touch surface capable of being touched by a touch end; a monitoring unit adapted to monitor contact information between the touch end and the touch surface and send the contact information to a processing unit; and the processing unit adapted to process the contact information so as to judge whether the touch end effectively contacts the touch surface, wherein the touch end is a human finger, the touch surface capable of being touched by the touch end is any other human body region capable of being touched by the human finger, the contact information includes contact strength information, the monitoring unit comprises a pressure monitoring unit or a vibration monitoring unit, the pressure monitoring unit or the vibration monitoring unit is adapted to monitor the contact strength information produced between the touch end and the touch surface and send the contact strength information to the processing unit, and wherein the processing unit comprises a comparison module and a judging module, and a contact strength threshold information is pre-stored in the processing unit; wherein the comparison module is adapted to compare the contact strength information with the contact strength threshold information and to send a comparison result to the judging module, and the judging module is adapted to judge whether the contact strength information is effective in accordance with the comparison result, wherein the processing unit is further adapted to judge whether the touch end effectively contacts the touch surface by judging whether there is a human body closing current formed between the touch end and the touch surface and whether the contact strength information is effective, when it is judged that there is a human body closing current formed between the touch end and the touch surface and the contact strength information is effective, it is judged that the touch end effectively contacts the touch surface; when it is judged that there is a human body closing current formed between the touch end and the touch surface but the contact strength information is ineffective, or when it is judged that there is no human body closing current formed between the touch end and the touch surface, it is judged that the touch end does not effectively contact the touch surface, wherein the contact strength information is effective in a case where the contact strength information is larger than the contact strength threshold information, and the contact strength information is ineffective in a case where the contact strength information is equal to or smaller than the contact strength threshold information.