Method for installing undersea production equipment

Provided is a method for installing undersea production equipment. The method comprises the following installing steps that firstly, the undersea production equipment is lifted from a deck of a dynamic positioning vessel and lowered to a set position under the sea through a crane on the dynamic positioning vessel; secondly, a lifting lug arranged on a balancing weight is connected with a lifting hook of the crane through a snap ring and a sling; thirdly, the crane is started to lower the balancing weight onto the undersea production equipment under the sea and horizontally align the balancing weight with the opening of a guide limiting groove in the undersea production equipment; fourthly, the balancing weight is slowly embedded into the guide limiting groove in the undersea production equipment through the crane, and then the installing process is finished. By means of the method, the undersea production equipment can be assisted in setting in place smoothly; besides, a vertical load can be provided for the