Four-wave-crest lap joint roof board convenient to construct

The four-wave-crest lap joint roof panel convenient to construct comprises a roof panel body, a pressing mechanism is arranged on the upper surface of the roof panel body, a lap joint plate is fixedly connected to the left side face of the roof panel body, and a lap joint groove is formed in the right side face of the roof panel body. A positioning mechanism is arranged between the lap joint plate and the lap joint groove, the pressing mechanism comprises a fixing block, the fixing block is fixed to the upper surface of the roof panel body, an extrusion groove is formed in the fixing block, a pull rod is slidably connected to the interior of the side wall of the fixing block, and the end, located in the extrusion groove, of the pull rod is fixedly connected with an extrusion block; the end, away from the extrusion block, of the pull rod extends to the outer side of the fixing block. According to the utility model, the extrusion block is controlled to move by utilizing the elastic force of the extrusion spring