The utility model discloses a PC phase transition heat -retaining plate suitable for sunlight greenhouse equipment, this equipment include well casement PC board, transparent film, phase change material, heat preservation, gas pocket, upper sealing groove and the lower seal groove of 10mm and above thickness. Wherein phase change material pours into at well casement PC inboard, and transparent film covers the neat face at well casement PC, and the heat preservation is pasted at well casement PC backboard face, and the gas pocket is dug on well casement PC board top. This equipment can utilize phase change material phase transition in -process physical state change to absorb or release released heat, can make full use of green energy solar energy, reduce the energy consumption expenditure, and can collect the heat more than needed on daytime again and be used for night exothermic, improved night temperature. Drawing materials of this equipment is easy, low cost, and simple process is reliable in the preparation, can be applicable to the sunlight greenhouse of all kinds and various new and old degree, has fine using value.