The invention discloses a connection method for a groove type solar parabolic reflector. The method includes the steps of determining the positions of reflector connection clamps on a back plate of the parabolic reflector through a laser positioning and indicating device; fixing the reflector connection clamps to the back plate of the parabolic reflector and inserting plugs of hooks into insertion grooves of the reflector connection clamps; and moving the parabolic reflector to the position above a reflector support, aligning second through connection holes in the hooks to strip-shaped locating holes of the reflector support, placing bolts into the second through connection holes and the strip-shaped locating holes and fastening the bolts. According to the method, the installation accuracy of the groove type solar parabolic reflector can be guaranteed, and installation errors can be effectively reduced.