Method for producing formaldehyde by using urea-formaldehyde distillate in participation and absorption mode

The invention relates to a method for producing formaldehyde by using urea-formaldehyde distillate in a participation and absorption mode, and relates to a urea-formaldehyde glue and formaldehyde production method. The method comprises a formaldehyde production line and an end buffer tank of a urea-formaldehyde resin adhesive production line. The invention is characterized in that distillate in the end buffer tank of the urea-formaldehyde glue is sent to a glue precipitation tank by a first pump for depositing the glue; then the glue precipitation tank is successively communicated with a glue filter, a secondary pump, a reflux valve and a reflux port of the glue precipitation tank, distillate is circulated and pumped to the glue filter for filtering the residual glue; a valve is connected in a pipe which connects the secondary pump and the reflux valve through three-way tube, the valve is communicated with an absorbed water inlet pipeline at the top of an absorbing tower on the formaldehyde production line, t