The present invention provides a kind of system for protecting net unfolding and recovery comprising two support frames, a protective net and a power device. Each support frame have before, two pillar of Hou, one first cable, one second cable and multiple sliding parts. Two terminal systems of first and second cable set what before this, on two pillar of Hou respectively, which can be pulled. First cable and the second cable system pass through each sliding part, those sliding part systems are slided with respect to first cable. The protective net has two opposite sides at a, front and a Hou, which is separately connected those sliding parts, and the both ends system on the Hou side is distinguished on fixed what two Hous pillar. Wherein two sliding part systems of the position in the two sides in front of the protective net are fixed on what two second cable respectively. The power device system is to pull two second cable.本發明提供一種防護網展開及收復的系統，其包括兩支撐架、一防護網及一動力裝置。每一支撐架具有前、後兩支柱、一第一纜線、一第二纜線及多個滑動件。該第一及第二纜線的兩終端係分別設於該前、後兩支柱上，該第二纜線能被拉動。該第一纜線及該第二纜線係穿過每一滑動件，該些滑動件係相對該第一纜線滑動。該防護網具有兩相對側邊、一前邊及一後邊，該兩側邊係分別連接該些滑動件，該後邊的兩端係分別固設於該兩後支柱上。位在該防護網的前邊的兩側的其中兩滑動件係分別固定於該兩第二纜線上。該動力裝置係用以拉動該兩第二纜線。
